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Rogue DHCP virus in the network

Q: Rogue DHCP virus in the network

I saw something relating to rogue DHCP virus earlier in this forum however I do not believe it is what we are experiencing.

On Friday our company got hit with a redirect which appeared to be from W3.org, but spoofed. It was then stating to "update" your browser for incompatibility. It is an unknown as to whether or not (:P) anyone actually "clicked" on the update, but since then a "phantom" DHCP server comes up every so often upon various PC's at this point I know it is traveling around.

After quick diagnosis we determined that something was "creating" a DHCP server on our XP PC's. A redirection then sent the PC to a network out of Eastern Europe. This effectively was starting to swarm across the network and replacing DHCP settings.

It is a rootkit and I am using Combofix to remove it, I am aware of the dangers of using Combofix having used it for nearly 10 years now. I would rather take the risk of damaging a PC than my network. I just have not had time to review the logs and see much info. Even if I did, we all know what the answer is to that.

My question is does anyone know what this is and how to stop it? It has popped up several times since and believe it may be floating around somewhere within the network, but what to look for and if possible how to prevent the future outbreak, I am shooting from the hip currently playing whack-a-mole.

So in the end I am looking for what is this rootkit named and also looking for a good enterprise rootkit removal.


Preferred Solution: Rogue DHCP virus in the network

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A: Rogue DHCP virus in the network


Without seeing any logs it is impossible to diagnose this infection.

It sound like this is a fair sized company and I think the best option is going to be to contact you IT department/support and have them remove the infection.

We are here to assist the home users who fall fail to infection, I am afraid it is not really our place to take over from your paid/onsite IT support.

All the time these machines are networked, you will be chasing your tail trying to remove this.

Your IT department should be able to clean the network in next to no time.


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Hi all-I have a computer that was acting as a rogue dhcp server on our subnet- however since the computer did not have dhcp capabilities installed, and the mac address of the NIC in question only appeared when DHCP requests were being made, only to soon disappear from the ARP tables soon afterwards. This lead me to believe it might be malware. The only other thing I can think of is the vmware workstation software on the laptop was misconfigured. Regardless here is the hijackthis log file. Thanks in advance and any help would be appreciated.Logfile of Trend Micro HijackThis v2.0.2Scan saved at 3:32:32 PM, on 6/23/2010Platform: Windows XP SP3 (WinNT 5.01.2600)MSIE: Internet Explorer v7.00 (7.00.6000.16876)Boot mode: NormalRunning processes:C:\WINDOWS\System32\smss.exeC:\WINDOWS\system32\winlogon.exeC:\WINDOWS\system32\services.exeC:\WINDOWS\system32\lsass.exeC:\WINDOWS\system32\svchost.exeC:\WINDOWS\System32\svchost.exeC:\Program Files\WIDCOMM\Bluetooth Software\bin\btwdins.exeC:\Program Files\Symantec AntiVirus\Smc.exeC:\WINDOWS\System32\svchost.exeC:\WINDOWS\System32\svchost.exeC:\Program Files\Common Files\Symantec Shared\ccSvcHst.exeC:\WINDOWS\System32\WLTRYSVC.EXEC:\WINDOWS\System32\bcmwltry.exeC:\WINDOWS\system32\spoolsv.exeC:\Program Files\... Read more

A:possible rogue dhcp malware

Hello , And to the Bleeping Computer Malware Removal Forum. My name is Elise and I'll be glad to help you with your computer problems.I will be working on your malware issues, this may or may not solve other issues you may have with your machine.Please note that whatever repairs we make, are for fixing your computer problems only and by no means should be used on another computer.The cleaning process is not instant. Logs can take some time to research, so please be patient with me. I know that you need your computer working as quickly as possible, and I will work hard to help see that happen. Please reply using the Add/Reply button in the lower right hand corner of your screen. Do not start a new topic. The logs that you post should be pasted directly into the reply. Only attach them if requested or if they do not fit into the post.Unfortunately, if I do not hear back from you within 5 days, I will be forced to close your topic. If you still need help after I have closed your topic, send me or a moderator a personal message with the address of the thread or feel free to create a new one.You may want to keep the link to this topic in your favorites. Alternatively, you can click the button at the top bar of this topic and Track this Topic, where you can choose email notifications. The topics you are tracking are shown here.-----------------------------------------------------------If you have since resolved the original problem you were having, we would appreciate you let... Read more

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Obscure problem I'm having.

Basically my IPTV provider (Telus communcations) provides a highly restricted and practically unuseable Actiontec V1000H for Internet/IPTV. Their logic is that it's for QoS reasons and that most users will not need to mess around with it. I'm not most users. My 2 TV boxes get upset when I disable the DHCP and try to setup static IPs with the Actiontec (Gateway It doesn't help that the TV boxes have no configuration abilities. I need my home LAN to play nice with a second rogue DHCP running on the same copper. Subnetting may work but the logistics are a little over my head. Could I use a managed switich to route DHCP broadcasts from the rogue DHCP to the MAC addresses for the TV boxes only? I do have limited access to the DHCP settings on the Actiontec, but thus far messing with them hasn't provided results. Most of the time it just crashes the router.

My home is in a Wifi noisy townhome complex, so I need a solid wired setup. All my rooms are served by cat5e and I have lots of switches and a couple other routers to use (DIR-655 & DIR-600L). Also a hugely overkill Cisco/Linksys SRW-2048 managed switch, but my mounting options around the patch panel are limited so I'd like to avoid it. I'll buy a smaller managed switch if I need to.

Currently I have 1 TV working connected directly to the Actiontec router. Everything else in the house has the DIR-655 (Gateway running as a DHCP (10.0.0... Read more

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We have a network of 20 PCs and 20 Macs with manually assigned IP addresses of - 199, and use OpenDNS for DNS service for filtering purposes. We use a Netgear Router (WNDR3400) for DHCP, and the range assigned is - 254.

IF we allow DHCP assigned addresses (on PC) we get a IP address of, subnet mask of with a gateway of ! If I allow DHCP on Macs, I get a 169.xxx.... address, which I know is internal. If I allow DHCP on WiFi on Macs, I get

How do I find out where this address is coming from? Is it one computer that is broadcasting this? Or is on multiple computers. I've thought of unplugging them one-by-one and then renewing the lease to see if I can nail it down, but if more than one, I would be chasing my tail.
Does this sound familiar?

I have other issues on PCs, such as not being able to browse workgroup computers. It tells me that "Workgroup is not accessible... The network path was not found." Aaargh

Thanks for your help, or even trying.. I'm lost and the local tech I brought in just scratched their head and took my money.

A:Rogue DHCP Server and how to locate

Is it one computer that is broadcasting this?Click to expand...

Maybe it is computer(s), but I would suspect a router.

Don't know how to track either down other than by walking around and looking for a router. Or with a Wi-Fi detector walk around looking for a wireless network that shouldn't be there. You can use a laptop as a Wi-Fi detector with utilities such as the Xirrus Wi-Fi Inspector (or gadget).

Or maybe Advanced IP Scanner (or similar) would help. Scan for one of the IP ranges and then for the other. If you find a router that shouldn't be there, or a computer on both networks, maybe that would give a clue.

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Three PCs in my environment, all running Windows XP Professional SP3, are infected with a virus or combination of virii. Most notably, they are running rogue DHCP servers which point DNS to on clients which pick up an IP address from these DHCP servers. The infected PCs themselves have DNS statically set to I have run rkill and Malwarebytes' Anti-Malware and Trend Micro Officescan against them but this has not solved the issue. It doesn't seem to be correctly detecting and removing the infection.

Please advise what is needed.

A:Three PCs in the environment are hosting rogue DHCP servers

Hello and welcome to the forums!My secret agent name on the forums is SweetTech (you can call me ST for short), it's a pleasure to meet you. I would be glad to take a look at your log and help you with solving any malware problems.If you have since resolved the issues you were originally experiencing, or have received help elsewhere, please inform me so that this topic can be closed. If you have not, please adhere to the guidelines below and then follow instructions as outlined further below:Logs from malware removal programs (OTL is one of them) can take some time to analyze. I need you to be patient while I analyze any logs you post. Please remember, I am a volunteer, and I do have a life outside of these forums.
Please make sure to carefully read any instruction that I give you. Attention to detail is important! Since I cannot see or directly interact with your computer I am dependent on you to "be my eyes" and provide as much information as you can regarding the current state of your computer.
If you're not sure, or if something unexpected happens, do NOT continue! Stop and ask!
If I instruct you to download a specific tool in which you already have, please delete the copy that you have and re-download the tool. The reason I ask you to do this is because these tools are updated fairly regularly.
Do not do things I do not ask for, such as running a spyware scan on your computer. The one thing that ... Read more

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I got all of these viruses and i can't work properly because of these.

Zlob.Trojan, Rogue.VirusTrigger, Rogue.Errorsmart, Rogue.System Antivirus 2008

I think i got more malware on. I believe it started when my sister inserted her flash disk on my pc.

What do i do?

A:Zlob.Trojan, Rogue.VirusTrigger, Rogue.Errorsmart, Rogue.System Antivirus 2008

Hello please run an MBAM scan on this PC. DO NOT put that Flash drive into any other PC's it is infected.Please download Malwarebytes Anti-Malware and save it to your desktop.Make sure you are connected to the Internet.Double-click on mbam-setup.exe to install the application.When the installation begins, follow the prompts and do not make any changes to default settings.When installation has finished, make sure you leave both of these checked:Update Malwarebytes' Anti-MalwareLaunch Malwarebytes' Anti-MalwareThen click Finish.MBAM will automatically start and you will be asked to update the program before performing a scan. If an update is found, the program will automatically update itself. Press the OK button to close that box and continue. If you encounter any problems while downloading the updates, manually download them from here and just double-click on mbam-rules.exe to install.On the Scanner tab:Make sure the "Perform Quick Scan" option is selected.Then click on the Scan button.If asked to select the drives to scan, leave all the drives selected and click on the Start Scan button. The scan will begin and "Scan in progress" will show at the top. It may take some time to complete so please be patient.When the scan is finished, a message box will say "The scan completed successfully. Click 'Show Results' to display all objects found".Click OK to close the message box and continue with the removal process.Back at the main ... Read more

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We are using  a DHCP Server,for our network we musst create new DHCP,how to add new DHCP and activate the scopes for

can someone give me some tips.

Thanks a lot.

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I have had a task dumped on me and am a little out of my depth.

We have a new EFM service, which is connected to a RAD Network termination Unit; in turn this is connected to a Cisco 887VAM router, which in turn is connected to a TP-Link TL-SG1024 switch.
I can connect any computer to the switch and can connect to the internet as long as I assign each one of the 5 static IP addresses I have.
How do I get it so that I can connect more computer and have them detect a generated IP address?
I gather this is to do with DHCP at the router but I don't know where to start.

Any help?


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Dear All,

I’m having some problems with my Wireless network.
I’m struggling to get my wireless devices to connect to my wireless network. The only way I can seem to do it, is by assigning them an IP address manually – otherwise they get given a 169.xxx.xxx.xxx number.
Ideally, I want the devises to get the IP address automatically.

Look at the diagram to see my network.

It’s not a secure network – I haven’t given the Wireless Router any Mac Addresses. I live in a very remote area, so I’m not bothered about security until I have it all working.

The wireless Router has 4 Earthnet Ports and 1 ‘Internet’ Port.

My ADSL Router has all my Internet settings
(Both are Netgear)

My question is: How do I get my Wireless devices to collect automatic IP addresses?

Hope you can help.

A:Wireless Network - DHCP - Help

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In early March I suddenly started having pop ups everywhere. I immediately ran malwarebytes and appear to clean an infection. But subsequently I started having symptoms of Google redirect virus and one of these links seems to have given me the Rogue Antivirus virus. I then clean as good as I could and after Malwarebytes and Adaware, and some McAfee Things seemed clear. However when I connected to the internet the Rogue Antivirus virus reappeared.I then discovered that the firewall(windows0 was turned off. I turned it on and no more reinstall of this have occurred, but all is not well. Along the way I lost the DVD drive and ability to use zip drive.I then used malwarebytes and cleaned, but it keeps reappearing and the google issue remains. The current situation is that about once or twice a week I will do a scan and have 2 registry entries changes for the Rogue Antivirus virus. Luckily no such virus is installed. I tried tdsskiller since I believe I had a rootkit virus. it detects, and then cleans, but it come right back. It detected "iastor.sys". I have run DDS, but when I tried to run GMER, I get(after a few minutes) a BSOD. The culprit is "iastor.sys". After many crashes I stopped the scan early(twice)and saved the log file before it crashed. I have 3 GMEr files. 1st at beginning(when GMER first started)2nd and 3rd at various scan stages(one a few seconds in and one 10 minutes in)I hope I have all the needed infoDDS FileDDS (Ver_10-03-17.01) - NTFSx86 ... Read more

A:rootkit virus,rogue antivirus, and google redirect virus

Hello and welcome to Bleeping ComputerWe apologize for the delay in responding to your request for help. Here at Bleeping Computer we get overwhelmed at times, and we are trying our best to keep up. Please note that your topic was not intentionally overlooked. Our mission is to help everyone in need, but sometimes it takes just a little longer to get to every request for help. No one is ignored here.If you have since resolved the original problem you were having, we would appreciate you letting us know. If not please perform the following steps below so we can have a look at the current condition of your machine. If you have not done so, include a clear description of the problems you're having, along with any steps you may have performed so far.Upon completing the steps below another staff member will review and take the steps necessary with you to get your machine back in working order clean and free of malware.If you have already posted a DDS log, please do so again, as your situation may have changed.Use the 'Add Reply' and add the new log to this thread.Thanks and again sorry for the delay.We need to see some information about what is happening in your machine. Please perform the following scan:Download DDS by sUBs from one of the following links. Save it to your desktop.DDS.scrDDS.pifDouble click on the DDS icon, allow it to run.A small box will open, with an explaination about the tool. No input is needed, the scan is running.Notepad will open with the results.Foll... Read more

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Hi all
I've got a network with 2 W7 and 2 XP PRO SP3 machines

I can see ALL of them on ALL machines but ONE just refuses whatever I do to allow direct access to it from EITHER of the W7 Machines (build 7137 x-64 )

All firewalls off etc.
same userid's passwords etc etc.

What's up with this one XP machine. W7 Networking never seems to work correctly at times. Never have a problem with SAMBA on 'NIX.


A:Rogue XP machine on Network -

hey jimbo

I had the exact same situation running win 7 on all machines except one xp for legacy stuff. Tried almost every under the sun but no joy. I think it was something to do with the way win 7 (homegroup) does network protocols, but the only way I could get access was to dual boot the xp machine. It was weird even in xp (with win 7 installed but not active) I was able to share, access all.

Sorry I couldn't be helpful


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We have a device out on our network that keeps obtaining the same IP address via our firewall's DHCP server. I'm not really sure how, but it's interfering with a printer that has a static IP address that's not even in the DHCP address pool. This is wreaking havoc with the availability of the network printer.

What's really strange is the mac address that keeps showing up as the problem sometimes appears on more than one IP address being handed out via DHCP. I just ran a Lizard Find Mac Address scan, and the same MAC address shows twice on two different IP's assigned by DHCP, and the vendor is "Samsung Electronics" Ltd. When I compare this against our firewall DHCP connections, all the devices from the Lizard scan that also show from Samsung Electronics are Droid devices. I can't find the IP attached to any of our wireless networks, so I'm assuming that the phone is possibly acting independently as a hotspot for others. I can't believe there isn't a way for network admins to terminate a DHCP lease remotely! I have no idea where this device is, or how to get it off my network. Any suggestions?!

A:Rogue device on network

Does your wireless access point support any kind of filtering to block connections by MAC address? This should work for stopping someone who is unknowingly connecting to your network.

Are you using any kind of encryption protection for your wireless access point(s)?

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Hello Internet Security (wo)Menz,

Maybe one of you guys can help bail me out here.

Here's the deal: The company I work at has been experiencing some weirdness on the network lately. A lot of users are complaining of slow down and that sort of thing.

Our network is split into several subnets, each cooresponds to a different plant. The internal network IP addresses start at xx.x.5.x and work their way up to xx.x.9.x ...

All of our main servers reside in the xx.x.6.x subnet, this location being the IT department HQ.

This is where it gets weird: Lately (perhaps a few months) the DNS hostname being returned for -all- machine traffic in the 6 subnet is being listed as "dynamic.dsl.nesma.net.sa" ...!!!

For example: On my work machine, if I go into command prompt and do a netstat, a few of my connections on the "foreign address" side are listed as dynamic.dsl.nesma.net.sa - multiple times. Yer when I do the netstat -n command to see the IP addresses associated with those connections, and NOT the DNS name, I see that those are connections to various servers in the 6 subnet... They appear to be legitimate network traffic, just with that strange DNS name showing up all over the place!

I did some digging, and the root domain of nesma.net.sa appears to be some kind of hosting company out of Saudi Arabia! But the exact address as listed does not appear to exist- which makes it seem like an internal rogue thing...A spoof address?

I have searched the '... Read more

A:Solved: Rogue network?

Bumpity bump.

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I have 3 network cards in my Windows 8.1 computer.   Each is attached to a different network.   I have assigned a static IP address to network card 1 which is on the internal LAN segment.   I want the other 2 network cards,
which are on different networks to run in promiscuous mode (IE.  No IP Assigned) so that I can sniff traffic.   There are no DHCP servers on those 2 other networks but there is one on the LAN which card #1 is plugged into.

My problem is that the 2 other network cards are getting IP addresses from the DHCP server on the card #1 network.   How is that possible?   If I disconnect card 1 from the network, the other 2 cards don't get an IP address.  
If I connect card #1 again, the other 2 cards get a DHCP assigned address.   So how to I stop network card #1 from forwarding DHCP traffic to cards #2 and #3?   Anyone know?



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Hello Everyone,

We our setting up a Training Company to assist unemployed IT people in the Silicon Valley area of California. Our group is very small and having a hard time even getting our network here started. Here is the problem: We have Windows 2003 Server Enterprise 180-day usage disc (from a book we bought to learn). We have 5 static IP addresses leased from DSL carrier. They are for example: thru with a gateway of [these are only IP numbers used for example to prevent hacking] my subnet mask is We tried and tried for 2 weeks now and still can not get the complete network to work. We need: Step1.) The server to be secure with a firewall (but willing to forgo that and add later) Step2.) the server to issue Ip addresses from a pool of thru 12 to 3 workstations running XP(we decided to make the server, subnet mask is and gateway Step3.) Have access to the internet on all workstations and the server too. All we have succeeded to do is get the dhcp to issue out addressses to the workstations and even that i think we got lucky. We think the problem is somewhere you need to tell the (maybe iprouting?) setup that the Public ip address is the and gateway, subnet info and to route to the server PRIVATE ip address
Thank you for any help. We are on very limited funds here and appreciate any help. My number is 925-984-9907 if you wish to call. We wil... Read more

A:DHCP Server using (1) Network card

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im having trouble connecting to my freinds belkin router across the street when using my new Dlink AP.
When using my laptop in a cirtain position i can connect and it recieves a ip from router okay.
Problem is i want to pick this signal up using this the Access point and boost it around my house.
When i log into the access point it shows that the router is connected to my access point okay so far. Problem is that it does not ever get an ip from the dhcp server. the router across the road has dhcp enabled and like i said earlier, the laptop gets an ip okay and connects to the net ..

My access point is a DLINK DWL 700p 802b and the remote router is a newer 802g..
I have MY AP configured in repeater mode using the routers mac. I dont know if i would be better off using accesss point mode or client mode because i dont know what there for..

So basically when using ap, laptops stuck on aquireing ip.... any help would be great...

A:Aquiring network ip from DHCP problem

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I am really suck with my network. I live in a shared house and the landlord seems to have no idea so I'm having to take control, though as you'll quickly notice I dont have much clue either.

We have a Virgin internet router downstairs, provided by thembut the wireless signal hardly passes the room, so there is a cat 5e cable through the wall, upstairs to a router that I have installed DD-WRT on, that we then intend everyone to connect to wirelessly, though some are wired.

I have put the cable from the Virgin box into the Linksys normal bit (not the one that you usually put the internet one in), but I have no idea what to do now. I've tried searching but all I can find is if I was picking up the internet wirelessly, but it its wired. A few things seem to mention DHCP though.

Any help would be amazing please. If you dont have time to write how, or point me in the right direction, then just the name of what I'm trying to do would be much appreciated, but any help would be great.

Thanks a lot,


A:Wireless DHCP network problems

one approach: multiple routers

I've written this several times, so I'll refer to a common post here.

Ask specific questions and I'll reply

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The Server went down - it is at shop for repairs. Meanwhile everyone can acecss internet fine - router is the DHCP and DNS server. However today one computer on the network is getting an APIPA address and can't ping the default gateway or any other computers on the network. Loopback ping works and device manager indicates network card is working correctly. Checked cables. Uninstalled and reinstalled network card. Rebooted several time. Anyone have any idea what to try next? All other computers on the network are accessing the internet just fine.

A:one computer on network can't get to DHCP server

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I am having a problem with an NVDIA network connection. The network is MB based 750i chipset.
After the latest batch of updates certain sites will not display certain objects. I have found the easiest test site is YouTube where the video previews are blank and the initial flash eventually pops up Connection Reset By Server. Google and other sites without this kind of information work fine. Also the Pandora Gadget does not work.

If I allow the adapter to use DHCP I have the problem, if I manually set the IP with the exact same information the connection works fine. I have pulled drivers out, updated everything, reinstalled drivers... used netsh int ip reset and netsh winsock reset. I'm not running anything except the windows firewall - that I know of.

I had this problem in Vista x64; but after going through everything eventually it started working. I originally though it was caused by VitrualBoxes Bridging adapter. I could actually get it working check the Bridging Adapter and cause it to behave exactly like this. However, unchecking it did not always fix it, it sometimes required reinstalling the drivers.

My x32 installation (this is a dual boot machine) doesn't have VirtualBox installed. I'm guessing it's something behind the scenes in the bindings; but I'm at a loss.

Any help would be appreciated.


A:NVDIA Network Problem only when using DHCP

Hi sulldawg,

Welcome to Vista Forums!

Although it sounds like you did some of this, please go to and follow the instructions in: Network Posting Tips. Even those parts you already did (at least some of them), do so again using the batch file to make sure it includes everything (and it can't hurt to do it again).

When creating the IPCONFIG /ALL screenshots, please do so both with and without using DHCP so we can see how they differ when it is and isn't working (you may need to include multiple images to capture everything and please be sure to label the files so we know which ones apply to which circumstance).

Thank you and good luck!

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I have this problem with a computer i'm trying to fix for my dad. This computer is used at his job, and its exposed to _a lot_ of dust. (not sure if this has anything to do with it, but there's a possibility)(also, the cooling rib for what i believe is the graphic processor was badly installed, and fell off as i opened the cabinet. I have put it back on with heat-carrying paste, and i still have a normal image on the screen, so i think it works...)

A bit about the specs, as far as i can remember them:

2 GHz Intel Pentium IV
512 MB RAM
AOpen motherboard
Sound, network and screen cards are on the motherboard
Running Windows XP Home

So all and all, a decent computer. This computer did have some spyware when i started looking at it, but it should be taken care of, as i bought Norton Internet Security 2006 and ran a full scan (i did not get to upgrade the definitions, reason for that will follow).

Before i installed it, i had arranged it so that the wireless network and internet worked on the computer. When i got back the day after, to install the Norton package, i noticed a lot of spyware, and took care of it. The computer was acting really slow for its specs, but after cleaning up a bit it works better. Now here is the problem: After i installed Norton Internet Security, the internet & network stopped working! Here's what i know:

Both the connection for LAN and WLAN contains protocols for Netware and IPX (even the new WLAN card that i bought did).... Read more

A:Network problem (possibly DHCP)

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I am running windows xp on a dell inspiron 4150 with a built in wireless card. My wireless was working fine until windows prompted me to reboot due to windows update. It stopped working after that. It is telling me that no ip address can be found and when I ipconfiged it with renew and all it still could not find it. It gave me an error message that says cannot connect to DHCP server.
Any help will be appreciated.
Thank you,

A:Network could not connect to DHCP server

Nothing really comes to mind, but if you're using Window's Wireless Zero Configuration maybe you need to reconfigure your wireless connection; especially if your network is protected with encryption.

I use the utilities from my wireless cards' manufacturers to connect to my WPA protectecd network and had no trouble today after the same reboot (two notebooks). Well, same reboot if you're talking about the critical update released yesterday.

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My Dell Inspiron 8400 Windows XP Media Center Edition was hijacked by some rogue trojan "XP Antivirus 2011". The HelpAssistant user folders also appeared at the same time so I think it all occurred in the same event. They pretended to be an e-mail from UPS.

To stop the Antivirus, I rebooted in Safe Mode and downloaded and ran Malwarebytes. It detected 4 files infected and 3 registry items infected. However, I am still not able to re-turn on the Windows Firewall in the tray icon(I have a Webroot firewall on).

The HelpAssistant folder kept replicating files and added two "users" to C;\Documents and Settings\. To stop this, I went to MyComputer, rightclick, manage, Local Users and Groups, Users, and deleted the user "HelpAssistant".

But I still think there is malicious stuff left from these events. Please help me get rid of it?

I have downloaded DeFogger and disabled according to instructions.
I downloaded DDS and there is the DDS.txt below:
I have attached the attach.txt document
I downloaded gmer and have attached the ark.txt document

Thank you , thank you, thank you I am so grateful for people like you since Webroot does not answer requests for help anymore unless you pay them a lot more $$ than just your annual subscription.

DDS (Ver_11-03-05.01) - NTFSx86
Run by Donna at 22:22:41.15 on Tue 03/29/2011
Internet Explorer: 7.0.5730.13 BrowserJavaVersion: 1.6.0_24
Microsoft Windows XP Professional 5.1.2600.3.1252.... Read more

A:XP Antivirus 2011 Rogue Virus and HelpAssistant Virus

Hello and welcome to the forums!My secret agent name on the forums is SweetTech (you can call me ST for short), it's a pleasure to meet you. I would be glad to take a look at your log and help you with solving any malware problems.If you have since resolved the issues you were originally experiencing, or have received help elsewhere, please inform me so that this topic can be closed. If you have not, please adhere to the guidelines below and then follow instructions as outlined further below:Logs from malware removal programs (OTL is one of them) can take some time to analyze. I need you to be patient while I analyze any logs you post. Please remember, I am a volunteer, and I do have a life outside of these forums.
Please make sure to carefully read any instruction that I give you. Attention to detail is important! Since I cannot see or directly interact with your computer I am dependent on you to "be my eyes" and provide as much information as you can regarding the current state of your computer.
If you're not sure, or if something unexpected happens, do NOT continue! Stop and ask!
In Windows Vista and Windows 7, all tools need to be started by right clicking and selecting Run as Administrator!
Do not do things I do not ask for, such as running a spyware scan on your computer. The one thing that you should always do, is to make sure sure that your anti-virus definitions are up-to-date!
Please do not use the Attachme... Read more

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Malware removal guides Following the procedures stated in the Remove Security tool and uninstall guide, all appeared ok until section no. 20 Hostsperm .bat download to desktop ok, but could not open the file. Noted it was in Notebook and to download it you must use the save facility.section 21. Found and deleted c:\windows\system32\drivers\etc\HOSTS, observed that Windows Vista HOSTS download link is in actual fact identified under Windows 2003 Hosts file download link. When trying to save Hostsperm.bat to system32\drivers folder, was flagged with a message stating I did not have the authority to save the file such. I am not sure of what to do next or how to set Hostsperm in system\drivers. Can you please advise. DDS (Ver_09-12-01.01) - NTFSx86 Run by brian at 16:05:59.64 on 21/02/2010Internet Explorer: 8.0.6001.18882Microsoft? Windows Vista? Home Basic 6.0.6002.2.1252.44.1033.18.1977.1032 [GMT 1:00]SP: Windows Defender *enabled* (Updated) {D68DDC3A-831F-4FAE-9E44-DA132C1ACF46}============== Running Processes ===============C:\Windows\system32\wininit.exeC:\Windows\system32\lsm.exeC:\Windows\system32\svchost.exe -k DcomLaunchC:\Windows\system32\svchost.exe -k rpcssc:\Program Files\Microsoft Security Essentials\MsMpEng.exeC:\Windows\System32\svchost.exe -k LocalServiceNetworkRestrictedC:\Windows\System32\svchost.exe -k LocalSystemNetwor... Read more

A:Rogue.multiple H,Rogue. pc Doc pro,Rogue.Security.T

Hello and welcome to Bleeping ComputerWe apologize for the delay in responding to your request for help. Here at Bleeping Computer we get overwhelmed at times, and we are trying our best to keep up. Please note that your topic was not intentionally overlooked. Our mission is to help everyone in need, but sometimes it takes just a little longer to get to every request for help. No one is ignored here.If you have since resolved the original problem you were having, we would appreciate you letting us know. If not please perform the following steps below so we can have a look at the current condition of your machine. If you have not done so, include a clear description of the problems you're having, along with any steps you may have performed so far.Upon completing the steps below another staff member will review and take the steps necessary with you to get your machine back in working order clean and free of malware.If you have already posted a DDS log, please do so again, as your situation may have changed.Use the 'Add Reply' and add the new log to this thread.Thanks and again sorry for the delay.We need to see some information about what is happening in your machine. Please perform the following scan:Download DDS by sUBs from one of the following links. Save it to your desktop.DDS.scrDDS.pifDouble click on the DDS icon, allow it to run.A small box will open, with an explaination about the tool. No input is needed, the scan is running.Notepad will open with the results.Foll... Read more

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Hi everyone, I've been noticing a Belkin router on my network for a while now and just yesterday another Linksys router as join the party, causing havoc on my connection speed!

I have tried all I could think of, I searched the internet for solution but found none.....Please help me out! How do I get rid of them for good? I've uploaded the two rogue router.

The strange thing is that I'm the only one seeing them through Norton on my laptop, all other computer on my home network is not detecting them. could this mean that someone is monitoring me? is possible? If I move permanently to Ubuntu linux would the problem go away? OR will they still be able to connect and monitor me? Too many questions, lol.....Please anyone, HELP!

A:How do I remove rogue router from my network?

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if it is a windows 7 box, try this: http://windows7themes.net/how-to-enable-dhcp-in-windows-7.html
if it is xp, try this: http://www.cs.cmu.edu/~help/networking/dhcp_info/dhcp_xp.html
if it is vista, the first one should work. now linux, is a little bit trickier, but i would have to know the version.

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So I have a small business I do IT work for. They are using Engenius WAPs for wireless which support multiple SSIDs and VLAN. DHCP is handed out by a Win2K8R2 server.

Now they want to set up a guest wireless network that only has access to internet and none of their internal resources. Problem is they need connectivity to the DHCP server. They have all dumb switches that don't support VLAN tagging.

I haven't worked much with VLANs, but I understand the concept and I'm trying to figure out if there is a way to provide what they wish (which is pretty straightfoward) without either

a. having to change the WAPs for something that have built in DHCP (that can be enabled on a per SSID basis) or
b. replace the dumb switches with switches that support VLANs

Any advice greatly appreciated. Thanks!

A:guess wireless network dhcp and vlan

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Hello, i was not exactly sure where i am supposed to post this question so if this isnt the right place i will delete this and repost where you tell me too, here is the problem.

I have a computer on a school network, i recently set up a WDS server to make rebuilding computers allot easier and faster. I created an image for a Inspiron Desktop 560ST but when i tried to redeploy the image back on the exact same computer while connecting to WDS deployment service i get this error.

<Installing windows>
WdsClient: An error Occured while obtaining an IP address from the DHCP server. Please check to ensure that there is an operational DHCP server on this network segment.

I do have a DHCP server and it is on.....

In the same screen i get the error i press shift+f10 to bring up CMD and type ipconfig and this is what i get

Windows IP Configuration

Ethernet adapter Local Area Connection:

Connection-Specific DNS Suffix . :
Link-Local IPv6 Address . . . . . . : fe80::70bb:e025:dd6c:cf84%2
Autoconfiguration IPv4 Address . .:
SubNet Mask . . . . . . .. . . . . . . .:
Default Gateway . . . . .. . . . . . .. :
_________________________... Read more

A:Solved: Can not connect to DHCP on a network computer

Networking would be the right section, I`ve moved the thread for you.

Does the card work while in Windows, maybe the network card is no good.

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I am setting up a linux box for a server on my home network which is DHCP, I don't want to change the entire network, I just need this server to have a static IP (so that I can get port forwarding to work). I don't even know if this is possible, if I were to give the server a static IP can my router deal with it, even though everything else is DHCP? My router is a linksys WRT54GS if that helps any.
An answer to this would be much appreciated. ^_^ Thanks

A:Solved: Is it possible to have one computer with Static IP on a DHCP Network?

Yes just make sure it sits outside of your DHCP scope so if DHCP starts at and has 100 seats then make the machine be or lower or and higher and it would be fine. Make sure to copy all other items from what DHCP would give you. E.G. DNS, Subnet mask and gateway.

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I warmly welcome

I have a problem with configuring network cards

WIFI comes nicely with DHCP pool 192.168.0 .*

I have a virtual network adapter "Microsoft Loopback Adapter"
in it I have to have a static IP address
and set it manually (IPv4)

the problem is that the WiFi card is still changing my IP address of the virtual card

how to prevent it?

I wanted to wifi card automatically collects the IP address
but did not interfere in the virtual adapter's IP

A:Wifi DHCP - the second network card on a fixed IP

I quote (from ):

Microsoft Loopback Adapter is a dummy network card, no hardware is involved. It is used as a testing tool for a virtual network environment where network access is not available. Also, you must use the Loopback adapter if there are conflicts with a network adapter or with a network adapter driver. You can bind network clients, protocols, and other network configuration items to the Loopback adapter, and you can install the network adapter driver or network adapter later while retaining the network configuration information.

Given that, there is no way your wi-fi card can "change" the IP address of your fake network adapter. If you set a static IP for ANY adapter, it WILL stay that way, regardless if one adapter is set to release and renew based on DHCP and one is not.

I even tried it myself. I installed the loopback adapter, set an IP and all that for it, released ALL DHCP'd IPs and renewed them. the static IP for the loopback adapter didn't change.

Take a look at your settings again, make sure you didn't miss something.

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Hello everyone,
I am working with a moderately sized network of about 75 devices. We have a device for our VOIP that supplies DHCP for the phones. Unfortunately this device is also handing out IPs to our other devices and causing them to be unable to see our other network services ( Internet filter and hosted applications ). I need to put a system in place to force our network to prioritize our other DHCP over our VOIP server. Setting a static ip address works but this is not an ideal solution.
VOIP - 10.172.0.X ( Forces all devices to have an address in this range when assigned to DHCP )
Network - 10.170.0.X

A:DHCP Issues on Moderate Sized Network

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so i have 3 computers and 2 ipod touches on my network.
2 computer are connected via ethernet and one via wireless.
1 pc on ethernet works just fine as well as one ipod touch.

the remaining, not so much.
i have done practically everything
the computers show up on the network, can trade files and look fine, but when i click on an internet browser, IM, or email, i get no connectivity.

i have verified DHCP is on and working.
i have pinged google.com and it timed out
i did the repair icon
restarted routers, and modem
i released and renewed ip settings via cmd
disabled and enabled network connections

so far nothing has worked, any help would be great appreciated.

A:no internet connectivity on SOME computers on network. DHCP is on

Please supply the following info, exact make and models of the equipment please.

Name of your ISP (Internet Service Provider).
Make and exact model of the broadband modem.
Make and exact model and hardware version of the router (if a separate unit).
Model numbers can usually be obtained from the label on the device.
Connection type, wired or wireless.
If wireless, encryption used, (none, WEP, WPA, or WPA2)
Version and patch level of Windows on all affected machines, i.e. XP (Home or Pro), SP1-SP2-SP3, Vista (Home, Business, Ultimate), etc.
The Internet Browser in use, IE, Firefox, Opera, etc.

Please give an exact description of your problem symptoms, including the exact text of any error messages.

If you're using a wireless connection, have you tried a direct connection with a cable to see if that changes the symptoms?
For wireless issues, have you disabled all encryption on the router to see if you can connect that way?
Have you connected directly to the broadband modem to see if this is a router or modem/ISP issue?
If there are other computers on the same network, are they experiencing the same issue, or do they function normally?

On any affected computer, I'd also like to see this:

Hold the Windows key and press R, then type CMD (COMMAND for W98/WME) to open a command prompt:

Type the following commands on separate lines, following each one with the Enter key:


PING yahoo.com



Right click in the comm... Read more

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Hi folks,

As I've said in the title, I'm looking to make a network with two routers but only having DHCP enabled on the secondary router.

Before I go any further I must ask: I have an Arris GT840A (sigh) as the primary ISP required modem. I'm currently connecting via wifi and sometimes have pings to the router coming back in the 1 - 20ms range for extended periods and it's decent. Other times I get a huge range of different ping times, often in the 300ms - 6,000ms range and sometimes even dropped.

Is disabling the DHCP server on the modem and relegating all local networking duties to my WRT54GV2 likely to alleviate this problem, or does this simply boil down to I'm screwed because I have to use this Arris modem?

Moving on with the primary question, here is my current setup:

Router 1: Arris GT840A
WAN IP: Dynamic / ISP assigned
DHCP: Enabled - 50

Router 2: WRT54GV2 (Connected to router 1 via WAN port)
DHCP: Enabled - 50

With my current setup I have been able to ping both router 1 and 2 via wifi, but I have not been able to ping or connect to the internet at large. I have read a couple of different how-to's and other forum answers and feel like this is how I'm supposed to be setting it up, but it's still not working. Something that concerns me about this attempted setup is that it still is using DHCP from the Arris modem / router, and I'm r... Read more

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here is what happen, I am using internet and tv from the service provider, so they send me a new router which handle internet traffic and TV traffic, but since it already doing so much the technician told me not to enable the wireless function, else it might crash often.

so I have two router now,
router A handles TV and Internet (PS3 and A labtop)
router B handles wired and wireless internet ( I have it MAC enable, so ppl won't be able to access my wireless network from outside)

how should I setup so PS3 can access movies from computers behind router B ?

EDIT: I tried to make them within the same subnet

router A : (DHCP 65-99)
router B : (DHCP 100-120)

when I connect router A with B by connect ethernet cable by LAN, Router A is able to ping a computer behind router A, but the computer can't ping router A.

and computers behind router B has no access to internet, but is able to log into the router B setup page.

A:Need help to link two router within one network, and two dhcp server?

Please use edit rather than create another post.

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my network card cant obtain IP from my DHCP server after I installed windows xp and loaded the drivers what i got was limited or no connectivity

thank you

A:my network card cant obtain IP from my DHCP server

Hello kwachaa and welcome to TSF...
Try to Repair Connection...
Double-click on Local Area Network and go to support tab and hit 'Repair' button...
Make sure you set to get Automatic Address automatically...
Hope this will help you mate...

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I have a question regarding DHCP on a established network. The network in work uses static IP addresses right now. The boss wants to enable DHCP so when he brings in his laptop he can just plug into the network and get on-line. My question is can I put DHCP on the NT server and just configure it for a small set of addresses Ex. to Or do I have to set up all the workstations and servers that are on the network to use the DHCP server?

A:{Advice Offered} - DHCP on an established network?

As long as you make sure the scope doesn't include IP addresses you are already using, you'll be fine. There is nothing wrong with a DHCP server only serving out to a few machines, while others remain static.

Of course, switching them all to DHCP might not be a bad idea, to make adding new machines, upgrading, etc... easier in the future. But you can do it a little at a time.

Get free stuff and help out a poor computer tech:
LarryCore begs for money

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At title states. I'm baffled

Unable to create a connection with the windows 7/64 machine. I've tried both dhcp and static with no resolve. Disabled/Enabled the adapter. Restarted the machine a few times. Uninstalled/Reinstalled/Updated/deleted the nic drivers and also let windows install its drivers. Used alternate eth cables / ports on hub.... other machines and mac work fine.

Network adapter states "This device is working properly"... local area connection status states:
ipv4 connectivity: no network access
media state: enabled

ran diagnose under the nic context menu and "troubleshooting couldn't identify the problem"...

System was working fine two days ago before I left for the weekend... machine was turned off before I left and was still off when I returned. Also, windows updates are set to manual.

A:Solved: Unidentified Network (DHCP / Static)

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I am located behind an authenticated squid proxy that blocks a computer if it gets too many invalid requests (requests without proper proxy settings and authentication).
Recently I found that my computer was blocked too frequently due to some kind of invalid requests.
however all i know from the log provided by my ISP (which runs the squid proxy server) is that my computer tried to connect to dapi.ds-intel.net:443 about 10 times every minute.
I have AVG internet security 2013 which has a built in firewall. It blocked some requests originating from a "SYSTEM" process about 4 times every minute too. However I cannot fiigure out what is bombarding the server and causing me to be banned from it. I did a virus scan and a rootkit scan with the same AVG application and found nothing.
As far as any Intel software is concerned, the only application I have installed is the Intel My WiFi Dashboard in the last week. The problem originated during this time. So I uninstalled it, bu the requests to the server just wont stop.
How can I identify what is making those requests and stop it from causing further problems?

A:identify a rogue program trying to access the network

So have you tried using Task Manager to identify the problem. The below explains how to use it.

Reap the benefits of Windows 7's Task Manager | TechRepublic

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Trying to install cable internet and the install program says I have an Intel Pro100b card installed and its not working properly. I must remove it in order to continue. Only it doesn't appear in Device manager or under Network Connections.

This is Windows XP btw.

It was my old card, I have a Pro1000 now. I put the Pro100b back in to see if that would help, but now it says I have a pro1000,and TWO pro100Bs, one of which is not working properly.

Where in the registry (or some other way) can I go to try and get rid of it? I tried searching for 'e100b' a string that's part of the driver name. I thought I found the 2nd card and deleted it but the install program still detected it. I must have missed something.

Any ideas?


A:rogue network card hidden in registry!

Here are the places that I know that it can lurk (This is for a 3com, the intel might have different numbers clsses folder numbers)


HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network\{4D36E972-E325-11CE-BFC1-08002BE10318}\Descriptions\\3Com EtherLink XL 10/100 PCI For Complete PC Management NIC (3C905C-TX)


HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EL90BC (This one I know is unique to 3com cards)

This is one of those things that seems like it is going to be a hard one to get rid of, due to the way the system spreads junk out into the classes keys.

One thing you might try, is seeing if deleting the second instance of the NIC, makes the old one go away.

Also, check out the bindings for the protocols in networking, maybe something did not unbind from the system.
For a more powerful registry editor with better searching, try http://www.resplendence.com/reglite I find that searching is much faster and displays the results in a seperate window sort of like an explorer search.

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Hello. I just moved to Auckland, NZ from the USA to go to school at the university here, and am having a problem connecting to the internet in the university residence hall in which I am living.
Wifi is not available in the residence halls, so we need to use an Ethernet cable. When I plug in my computer, the network adapter icon says “Identifying...” for a while then settles on “Unidentified Network” with no internet access, the IP is 169.x.x.x
When I try to release and renew the IP, it says “unable to contact your DHCP server, request has timed out"
I've tried multiple Ethernet cables, both brand new.
I tried connecting to a port in a friend's room in the same building, and even in a classroom on campus, and both had the same result.
Naturally after all that I assumed my NIC somehow died overnight while I traveled here, so I went to a computer repair shop expecting to have some hardware replaced, but we plugged it in there and it worked immediately so they weren't sure what to tell me.
I've gone through pages of old threads at this forum and others like it, trying solutions but having no luck.
I've power cycled my computer, obviously I can't power cycle the whole network as it's for 200 people, but the IT people here have tried resetting it for me on their end as best they can.
No network bridges
I've reset tcp/ip stack and winsock
It's not a static ip, set to obtain ip and dns automatically
No fire... Read more

A:Unidentified Network, Unable to contact your DHCP server

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Hello All, My company has been buying the M910Z systems since last year and I have noticed that the NIC card on these things will just randomly not pick up an IP address via DHCP when the PC is first powered on or when a network cable is unplugged. This doesnt happen everytime, but there are instances when the PCs go to sleep and the user is unable to connect back to the network due to the PC dropping the network connection. To resolve the issue, i have to either shut the PC down and then boot it back up or go into the control panel, diable/enable the NIC card in hopes for it to grab an IP. Is there a fix to this issue because im assuming its either a BIOS or NIC driver issue because I have isolated the issue down to these PCs and i wanted to see if the community could help me out here.

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Hi all

The nightmare begins: I turned my computer on last night and my interweb had broken!!! It was working the day before and for a good 6 months prior with not a hiccup. I've noticed that a million and 10 people have a similar problem.

I have a professionally set up simple home network between my own computer (Dell Inspiron Windows XP SP2) and my brothers Dell laptop (Windows 7). Brothers laptop WILL still connect to the internet fine.

We run a Dynalink ADSL2 Router to an 8 port Switch and then to our computers - yes, we use cables!

I'm on my work computer at the moment.

My computer still seems to be able to talk to the modem, it will detect an IP address and Subnet mask but then when it starts to locate the DNS is just gets stuck on 'Aquiring Network Address' for 5 minutes and cuts out with 'Limited or No Connectivity'. The latter being the case.

I am getting a 169.254.x.x IP address though. My brother's is totally different, starting with 198.... My subnet mask is

I've run every antivirus and spyware scanner I have. No baddies detected.
My Detect IP are all set to automatic. Everything is ticked where it's meant to be.
I have Enabled the NetBIOS whatsit.
DHCP is enabled.
I've 'Repair'ed till I'm blue in the face.
I've tried several different ports in the switch in case one was faulty.
I've done all the shutting down and starting up in sequence.
I've tried switching off fir... Read more

A:Acquiring Network Address - can't locate DNS/DHCP problem?

It could be a driver problem, so install the latest for your ethernet or do the System Restore you mentioned.

You are right to try different switch ports; best to (temporarily) use one that you know is now working. Same for the cable--make sure it is good by testing with another computer.

If you have a non-Windows firewall it could be corrupted so best to test by un-installing it and running the Removal Tool if one is provided.

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I have a problem with a Windows 7 64 bits. After power on, the DHCP client tries to acquire an IP for all the network cards, even those that are not connected.
I can see in the event logs that after 2 minutes from the startup, I get one message for each interface

Your computer was not assigned an address from the network (by the DHCP Server) for the Network Card with network address 0xMAC_ADDRESS. The following error occurred: 0x79. Your computer will continue to try and obtain an address on its own from the network address (DHCP) server."

I have an Astaro VPN client that manifests itself as a network card and when I start it up (manually) it fails to receive an IP from the DHCP server. I believe it is related with this general DHCP problem because if I start it up within two minutes from power on (before I get the message in the event log), then it works.

Any idea how to debug this problem?
I had a Dell connection manager which I uninstalled (thinking it will solve the problem), maybe this one left some bad traces. Any idea how to find and remove them?
In general, how would one know all the programs that are dealing/interfering with the network connections and dhcp settings?

A:DHCP client tries to aquire an IP for not connected network cards

See the following:

DHCPv6-client....Errors in event viewer.

That may help.

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I have a problem with my pc randomly locking up and having to be rebooted. I believe it has to do with the wireless card accessing my network, but I can’t figure out how to troubleshoot it. (If this is the wrong forum, please let me know!)

I have a desktop, two laptops, and a printer on a wireless network. All of them have been working fine. Then, about a month ago, I loaded a new game on my desktop, which worked entirely fine for roughly three weeks. Then last week, I tried setting up a server in the game. On my first attempt, it locked up my pc at the setup server stage, and I had to reboot. On my second attempt, I tried a slightly different configuration, and it created a local server and worked just fine.

Everything seemed okay for a couple of days, and then the game started to lag after a few minutes of play. After two or three more rounds of play, the lag was then accompanied by the pc locking up. Couldn't figure out why, so I stopped playing it.

Within a day or two, my desktop would randomly freeze without warning, with no clear connection to any specific application or time of day. This has continued to today. Sometimes the lock up is preceded by erratic behavior, such as the wireless keyboard freezing up though the companion wireless mouse will work (or vice versa) and an occasional USB connecting-then-disconnecting sound, though nothing had been touched. Sometimes the lock up is for 10 seconds or so. Most of the time, though, there are no warnings, and it ... Read more

A:Solved: Lock ups due to DHCP / network card issue?

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I'm trying to setup an FTP server to upload photos and videos to, and tried to setup a program to automatically change the ip on the domain every time it changes, but have been having trouble with it.

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Hello, I have been experiencing some problems on my home network. I have problems with AOL, FTP and steam online games like counterstrike, team fortress 2, and day of defeat. I get these problems about 3/4 of the time, and 1/4 these programs will work.

When I sign into AOL I get a message saying "Could not connect to authentication server:
Windows socket error #10060". On FTP about half of the time I am not able to connect, and I the connection keeps timing out. On the steam games, when I open up the game dialog, I don't get the auto-retry option that is normally available. I tested these problems on other computers at my house and the same behavior occurs.

A:Solved: Problems on a DHCP wireless home network

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I have two laptops, L1 and L2. Recently, L2 stopped connecting to the internet via my Linksys wireless router. However, L1 can still connect just fine via the same router. L1 runs winXP SP3, L2 runs win7 Home Premium x64 SP1. Usually when L1 or L2 stops connecting, I turn off the wireless cards on both computers, power-cycle the modem and router, turn on the wireless cards, and then the laptops both connect. However, this workaround isn?t working for L2 anymore.

The event viewer shows errors such as the following:

The IP address lease for the Network Card with network address 0x70F1A12F2601 has been denied by the DHCP server (The DHCP Server sent a DHCPNACK message). Event ID 1002.


Your computer was not able to renew its address from the network (from the DHCP Server) for the Network Card with network address 0xA4BADBB01388. The following error occurred: 0x79. Your computer will continue to try and obtain an address on its own from the network address (DHCP) server. Event ID 1003.

(I tried using both the wireless and ethernet cards, but both experienced the same lack of connectivity, with the same error messages.)

I have found seemingly relevant threads here and here, but the solutions proffered have not worked.

The network diagnostic tool says:

Root Cause: Your computer appears to be correctly configured, but the device or resource (DNS server) is not responding. Root Cause Guid: {902390d9-0cd9-4f91-9e6c-8fa5e6dad657}... Read more

A:limited network connectivity - DHCP and DNS servers not responding

I should clarify that the problem was with L2, running win7. L1, running xp, had connectivity the whole time. Before doing a system restore, I also tried resetting the router (pushing reset button in back for 30 seconds), but that didn't solve the problem.

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