Computer Config > Admin Templates > Network > Offline Files

Allow or disallow use of offline files feature  Disabled
Prohibit user config Enabled

Administrative Templates > Windows Components > Remote Desktop Services >Remote Desktop Session Host > Connections

Allow users to connect remotely using Remote Desktop Services Enabled

1. Go to Start > Administrative Tools > Policies
2. Select the policy to edit (Usually: the default policy), right-click and choose “edit”.
3. Go to Administrative Templates > Network > Network connections > Windows Firewall > Domain Profile.
4. Disable the “Protect All Network connections” rule.  Just to be sure, you can do the same for the “Standard Profile”, as well.

gpupdate /force  to reload clients GPO

Screencast – How to Install a Windows 2008 Server Forest – Adding AD Domain Services Role