I am trying to specify a proxy server that I want users to connect to. I have created a group in Active Directory for the users that I want to restrict / forbid access to certain URLs then added the group to the GPO. After running gpupdate /force the Automatically detect settings checkbox is checked and proxy server Address is specified in grey.
I then need to manually check the Proxy server "Use a proxy server for your LAN" checkbox in order to connect to the proxy server. Is there a way to force enable this checkbox using an Administrative Templates setting or similar using Windows Server 2003?