Since moving from Internet Explorer Maintenance Mode to preferences for IE proxy settings deployment, we have noticed that the Internet Explorer proxy settings disappear after a period of time. If the user does a GPUPDATE and then closes and reopens IE, the system will return to normal until the next policy refresh interval. As far as I can tell this only impacts IE. We have not seen another other policies impacted, so we are posting this here first just to see if anyone working with IE has already seen this. Systems are Windows 7 64Bit (fully patched) with IE8 and IE9 (both impacted). Domain Controllers are server 2008 R2 (Fully Patched).
The following settings are set in group policy:
Configure Internet Explorer Maintenance policy processing
Enabled - Process even if the Group Policy objects have not changed.
Configure Registry policy processing
Enabled - Process even if the group policy objects have not changed.