How to block user from change Proxy

How to block users from change Proxy sitting in internet explorer and Mozilla Firefox ?
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Venugopal NCommented:
It can be done through GPO for IE..
Joseph DalyCommented:
To block the changing of proxy servers through group policy for internet explorer you can find the settings under the following section.

User Settings > Administrative Templates > Windows Components > Internet Explorer

You will probably also want to statically set your proxy server info under the following location.
User Settings > Windows Settings > Internet Explorer Maintenance > Connection

As far as mozilla there arent any MS provided ADM templates for this.. So you will need to use a third party ADM file. Somethine like the ones below, but be aware I have never used these so I cant vouch for them.

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Venugopal NCommented:
The policy settings are located in the following locations in the GPO:

First Provide the Proxy setting...
User Settings --> Windows Settings --> Internet Explorer Maintenance --> Connection
Then open the Proxy Settings window and add for port 80.

To Block Proxy setting..
User Settings --> Administrative Templates --> Windows Components --> Internet Explorer
Then set Disable Changing Proxy Settings
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