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Problem with DNS

A

andyt1187

Junior Member
I was over at my Uncle's trying to fix his computer:

'Cannot connect to Internet' was the problem. My aunt's computer was fine and my EeePC that I brought could connect OK (both wirelessly and wired).

I ran 'ipconfig /all' on his machine and mine. The parameters all matched my computer when I ran it (except the last IP #).

Ping'd: 198.168.1.1, 127.0.0.1, and google's IP. All fine. Tried 'ping www.google.com'. Not working. Apparently this is a DNS issue?

Then I noticed he had the 'Antivirus 2009' virus/spyware and apparently that screws with DNS. Removed it (exe, registry entries via Safe Mode), still nothing.

I opened UDP port 53, and even disabled all security at one point. I cleared DNS cache via 'flushdns'. And reset all the TCP/IP settings to Windows default via command prompt. Nothing seemed to work.

Any ideas? It was a very frustrating few hours trying to work with this...
 
Did you 'registerdns'? after you flushed it?

Other causes could be a screwed up hosts file, maybe modified by a virus or spyware. Nothing else off the top of my head.
 
Go into the router and find what the DNS servers are from the ISP. Enter those DNS servers in the TCP/IP properties. See if you can resolve then.
 
Originally posted by: andyt1187

Then I noticed he had the 'Antivirus 2009' virus/spyware and apparently that screws with DNS. Removed it (exe, registry entries via Safe Mode), still nothing.

Any ideas? It was a very frustrating few hours trying to work with this...
Click to expand...

Are you sure it is completly removed?

See this all the time - 'AntiVirus 2009' is your baby, it will stop ISP connection through IE. ( I am presuming you are using IE? ) Get Fire Fox on the PC, allow you to connect. User Malwarebytes - free download, update definitions prior to running a full scan. Also Bit defender - free on-line scanner version, run one after the other. Should clear it out.

Then check your scan results, find out exactly what it is. Check your program files & registry. May have to search and remove from the registry - I have even seen it so far as having to edit the MSCONFIG & etc host file as well.

Good luck. There is also 2008, 2010, all with the 'AntiVirus' label.



 
Originally posted by: deaner
Originally posted by: andyt1187

Then I noticed he had the 'Antivirus 2009' virus/spyware and apparently that screws with DNS. Removed it (exe, registry entries via Safe Mode), still nothing.

Any ideas? It was a very frustrating few hours trying to work with this...
Click to expand...

Are you sure it is completly removed?

See this all the time - 'AntiVirus 2009' is your baby, it will stop ISP connection through IE. ( I am presuming you are using IE? ) Get Fire Fox on the PC, allow you to connect. User Malwarebytes - free download, update definitions prior to running a full scan. Also Bit defender - free on-line scanner version, run one after the other. Should clear it out.

Then check your scan results, find out exactly what it is. Check your program files & registry. May have to search and remove from the registry - I have even seen it so far as having to edit the MSCONFIG file as well.

Good luck. There is also 2008, 2010, all with the 'AntiVirus' label.
Click to expand...

It's not IE, he said he cant resolve from a command prompt. Big difference. That would keep Firefox from working as well.

 
Originally posted by: Paperlantern

It's not IE, he said he cant resolve from a command prompt. Big difference. That would keep Firefox from working as well.
Click to expand...

Yeah Paperlantern, indeed you are also probably so very right. However, without any further comment from the OP, hard to determine an exact 'difference' at this time. Would be interested to see how this plays out..

 
Yeah I am curious as well. But alas.... this thread may die without the OP coming back to say what caused it... like so many others... I see it all the time with people who registered only to post a question, then forget they did or if they dont get an answer in a couple of hours, never bother to check again. oh well. Lets hope he comes back soon.
 
Hey. Sorry I just haven't had a chance to try out the suggested fixes yet. I should have just brought his laptop back with me...

I have no idea what caused it. Its hard to get specific answers from my family members.

I did clean out the registry. Nothing was going through DNS in Firefox or command line so I didn't even bother trying IE. Firefox also connected OK when I typed in Google's IP.
 
Originally posted by: zuffy
Go into the router and find what the DNS servers are from the ISP. Enter those DNS servers in the TCP/IP properties. See if you can resolve then.
Click to expand...

I manually set the DNS servers to the ones in the router.
 
Originally posted by: andyt1187
Originally posted by: zuffy
Go into the router and find what the DNS servers are from the ISP. Enter those DNS servers in the TCP/IP properties. See if you can resolve then.
Click to expand...

I manually set the DNS servers to the ones in the router.
Click to expand...

So this resolved it then? I am not sure if he is saying he just tried this. Or stating that this was what fixed it.
 
Originally posted by: Paperlantern
Originally posted by: andyt1187
Originally posted by: zuffy
Go into the router and find what the DNS servers are from the ISP. Enter those DNS servers in the TCP/IP properties. See if you can resolve then.
Click to expand...

I manually set the DNS servers to the ones in the router.
Click to expand...

So this resolved it then? I am not sure if he is saying he just tried this. Or stating that this was what fixed it.
Click to expand...

No, not resolved.
 
What are the contents of the C:\Windows\System32\drivers\etc\hosts file?

What happens if you type:
nslookup google.com
in the command prompt?

If that doesn't work, what happens if you type
nslookup google.com 208.67.222.222
 
OP: Download and run malwarebytes: www.malwarebytes.org (click the blue download link at the left)
Run malwarebytes twice, if the second one still detects infections, download run combofix second: http://www.bleepingcomputer.co...ix/how-to-use-combofix

Then run malwarebytes again and see if everything's cleared up.

Try this in normal mode first, however, if there not able to run, restart and start pressing F8 and go into Safe Mode, then try running those. That spyware infection needs cleaned up with those tools, once removed, you should be fine.
 
Originally posted by: kevnich2
OP: Download and run malwarebytes: www.malwarebytes.org (click the blue download link at the left)
Run malwarebytes twice, if the second one still detects infections, download run combofix second: http://www.bleepingcomputer.co...ix/how-to-use-combofix

Then run malwarebytes again and see if everything's cleared up.

Try this in normal mode first, however, if there not able to run, restart and start pressing F8 and go into Safe Mode, then try running those. That spyware infection needs cleaned up with those tools, once removed, you should be fine.
Click to expand...

That sounds very similar to my original post 😉

OP still hasn't said anything beyond: no, not resolved. I know I am trying to work out past the original info, specifically what you have done since..
 
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