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Windows 7: Internet not working yet network is connected.

17 May 2014   #21
Matthew Harbuz

Windows 7 Home Premium 64 Bit
 
 

Quote   Quote: Originally Posted by UsernameIssues View Post
Download Process Monitor to a USB flash drive.
There is nothing to install.
Just unzip and copy Procmon.exe to the desktop of the problematic computer.

Start Process Monitor (run as admin).
Accept the EULA.

When it starts for the first time, it automatically starts gathering data.
You can stop that via the button/icon with the magnifying glass.
Then de-select the 3 buttons/icons shown in the right part of this image:

Attachment 318163


Clear the data that was gathered:

Attachment 318164


Add a filter for the IP address of interest:

Attachment 318165


Add a second filter for the registry action of interest:

Attachment 318167


Start the data collection process.
(Use the same magnifying glass button/icon that you see in screenshot #1.)

Manually change the DNS setting back to automatic.
Then let's see if Process Monitor can find the app that changes it back to 127....


If I use the Windows interface to set the 127... IP as the DNS value, then I see this:

Attachment 318168


Hopefully, these steps will find the offending app on your computer. Unfortunately, there is a chance that the offending app calls another app to do that actual change to the registry and/or the offending app hides itself from Process Monitor.
No luck I'm afraid, the process monitor didn't show anything.

I looked at the advanced DNS settings and removed the DNS server ip shown in the picture but it keeps popping up. Is there anything else that's wrong with the advanced DNS settings?




Attached Thumbnails
Internet not working yet network is connected.-image.jpg  
My System SpecsSystem Spec
.
17 May 2014   #22
UsernameIssues

W7 Pro SP1 64bit
 
 

Please start Process Monitor again.

Process Monitor should show you the filter dialog box. If it doesn't, then stop the data collection, clear the data and manually open the filter dialog box.

Click on the button named Reset to remove all of the filters that we added (including the ones applied by the steps shown in the first image).

Let Process Monitor run and gather data while you manually change back to the "automatic" DNS setting.

Once you close all of the dialog boxes for making that manual change, open them again to see if the 127... address is back already. If it is, please stop the Process Monitor's data gathering.

Use Ctrl-F to search for 127.0.0.1 within Process Monitor.
My System SpecsSystem Spec
17 May 2014   #23
UsernameIssues

W7 Pro SP1 64bit
 
 

Quote   Quote: Originally Posted by Matthew Harbuz View Post
~~~
Is there anything else that's wrong with the advanced DNS settings?
No - nothing looks out of place on that screen except what we already know about...
...that pesky 127.... address.


We might need to involve some forum members that search for infections.
My System SpecsSystem Spec
.

17 May 2014   #24
TheCyberMan

Windows 7 Ultimate x64
 
 

Open a cmd prompt and type ipconfig /flushdns.

Re-boot com[puter for the flush dns to work.

Change DNS to obtain a DNS server automatically.

Re-boot Computer.

If an infection then it should return.

Edit: check DNS client in services that it is set to automatic and is started.
My System SpecsSystem Spec
18 May 2014   #25
Layback Bear

Windows 7 Pro. 64/SP-1
 
 

On my third cup of coffee and got a thought.

Iobit Advanced System Care and their other programs.
If Iobit has been on this computer all kinds of goofy things could be happening.
Including Iobits trying to call home to China.

I will go back to watching.
My System SpecsSystem Spec
18 May 2014   #26
Matthew Harbuz

Windows 7 Home Premium 64 Bit
 
 

Quote   Quote: Originally Posted by UsernameIssues View Post
Please start Process Monitor again.

Process Monitor should show you the filter dialog box. If it doesn't, then stop the data collection, clear the data and manually open the filter dialog box.

Click on the button named Reset to remove all of the filters that we added (including the ones applied by the steps shown in the first image).

Let Process Monitor run and gather data while you manually change back to the "automatic" DNS setting.

Once you close all of the dialog boxes for making that manual change, open them again to see if the 127... address is back already. If it is, please stop the Process Monitor's data gathering.

Use Ctrl-F to search for 127.0.0.1 within Process Monitor.
Ok so I did that and it highlighted this...


Attached Thumbnails
Internet not working yet network is connected.-image.jpg  
My System SpecsSystem Spec
18 May 2014   #27
Matthew Harbuz

Windows 7 Home Premium 64 Bit
 
 

Quote   Quote: Originally Posted by TheCyberMan View Post
Open a cmd prompt and type ipconfig /flushdns.

Re-boot com[puter for the flush dns to work.

Change DNS to obtain a DNS server automatically.

Re-boot Computer.

If an infection then it should return.

Edit: check DNS client in services that it is set to automatic and is started.
Did everything you said and yep, it returned...


Attached Thumbnails
Internet not working yet network is connected.-image.jpg  
My System SpecsSystem Spec
18 May 2014   #28
UsernameIssues

W7 Pro SP1 64bit
 
 

Thank you for gathering that Process Monitor info again, Unfortunately, the WMI app highlighted is started by Windows - then the WMI app listens for commands for other apps. We could turn on WMI tracing, but that can be a mess to read and it too could lead to a dead end :-(

Let's see what TheCyberMan wants to try next.
My System SpecsSystem Spec
18 May 2014   #29
UsernameIssues

W7 Pro SP1 64bit
 
 

I am unclear about what all you tried while you were in the safe mode with networking. If you manually set DNS to automatic while in the safe mode with networking - does the offending app change it back to 127...?
My System SpecsSystem Spec
18 May 2014   #30
Matthew Harbuz

Windows 7 Home Premium 64 Bit
 
 

Quote   Quote: Originally Posted by UsernameIssues View Post
I am unclear about what all you tried while you were in the safe mode with networking. If you manually set DNS to automatic while in the safe mode with networking - does the offending app change it back to 127...?
No, in safe mode the DNS settings stay the way they should be. When I change the settings they don't change back.


Attached Thumbnails
Internet not working yet network is connected.-image.jpg  
My System SpecsSystem Spec
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 Internet not working yet network is connected.




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