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Internet Explorer Retaining Previous Proxy Settings

Posted on 2009-04-02
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Last Modified: 2013-12-08
In our environment we have a previously deployed ISA Server that we pushed users to via GPO into the autoconfigure script portion of the settings in IE.

However we are looking to migrate to a cloud based web filtering solution so we have to put thier proxy settings into the browser. I am planning to do this via a pac file.

I have the pac file crafted and it works correctly with firefox or a virgin install of IE ( never had our ISA configuration pushed to it ).

However if i change the configuration in the browser to somehting other than our ISA server the traffic still continues to "remember" the ISA server . I can witness this via ip checking sites.

Any idea where this information is hanging out and how to get rid of it to force my new pac file to actually be read in and utilized?
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Question by:prueconsulting
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mayank_chaudhary earned 2000 total points
ID: 24056937
THis is not a Normal case and usually it does not happen. However I have heard of such instances earlier also.

1. Perform the required change in the 'User Config>Windows Settings>IE Maintenance>Connection settings.

2. Select 'Import the current connection settings from this machine' Choose LAN Settings and modify them if need be to what you need. Ideally should leave all boxes unchecked.

3. Apply the settings and run a GPupdate /force.

4. Check the logs for any errors and test on a client PC.

5. if you later make changes under the 'Proxy settings' tab, it will override the settings in this area.

Hope it works
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Author Closing Comment

by:prueconsulting
ID: 31565907
This did work and unfortunately does seem to be the only way to get rid of the settings as GPO seems to hide things.
By overriding the GPO with a new setting it works.
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