Restricting Internet Access

Oh man! Ad-blocking software has been detected! :'(

This website is run by the community, for the community... and it needs advertisements in order to keep running. Blocking our ads means your killing our stats!
Please disable your ad-block, or become a premium member to hide all advertisements and this notice.

That should work though, you are basically just applying the GPO to a group of users in the OU. If you log in as a user and go to the command line and type gpresult is the GPO listed?

Group policy is generally one of the best ways to apply the proxy settings and therefore (in this case) block internet access through IE.