Proxy server keeps being checked off in browsers

Posted on 2010-11-10
Last Modified: 2013-12-07
I have a computer on a worgroup network in a small office.   It is

 running Win XP.    It seems like eveytime there is an update run for McAfee, the proxy server settings in IE and Mozilla Firefox get checked and the user cannot access the internet until the proxy server is unchecked.   I have run Malwarebytes and Spybot with little return for threats.  No one on the network has this issue even though they are using McAfee.
Question by:syssolut
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LVL 15

Accepted Solution

AmmarR earned 125 total points
ID: 34100969
go to gpedit.msc
from run and check your proxy settings, may be its enabled in the group policy


Assisted Solution

thetime earned 125 total points
ID: 34101024

Expand User Configuration
Expand Administrative Templates
Expand Windows Components
Select Internet Explorer
Edit "Disable changing proxy settings"
Set to "Enabled"

Change proxy settings to what you want it to be before setting this policy.
LVL 37

Assisted Solution

bbao earned 125 total points
ID: 34102028
if the proxy setting of FF is also changed, it should NOT be Group Policy related as FF does not use the Internet Settings of IE and Windows at all.

i would guess it is caused by some kind of security software installed on the computer such as the one mentioned above: McAfee.

try disabling or remove it for test??
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Author Comment

ID: 34271668
BBao, I will try that.   I am seeing them in two days.   Thanks
LVL 30

Assisted Solution

by:Sudeep Sharma
Sudeep Sharma earned 125 total points
ID: 34396241
It seems that your is infected since it is effecting both Firefox and IE as per my understanding.

To clean you system do the following:
Run malwarebytes in "Safe Mode" with Networking and update it before running a full system scan
Note: you should rename the mbam.exe to some dummy name like and then run it.

Then try HitManpro to make sure anything which might be left behind is clean:


If issue is not resolved by these tools try TDSSKiller:

Tutorial on TDSSKiller:

or you could also try FixTDSS.exe from Symantec

If this does not resolve your issue then try Combofix:

Download Combofix

Note: you should rename the Combofix.exe to some dummy name like and then run it.

Tutorial on how to use combofix:

Post logs here for further analysis.


Author Comment

ID: 34492907
Sorry I didn't reply on this.   All of a sudden, the issue has stopped.   I am not sure why, but I have not heard anything about this since.

Author Closing Comment

ID: 34492929
Thanks for your suggestions.

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