I am unable to edit the "Default Domain Controllers Policy" from a Server 2012 machine. The error message i recieve is:
"Failed to open the group policy object. You might not have the appropriate rights. Details: The volume for a file has been externally altered so that the open file is no longer valid."
The domain controllers are running Windows 2012 R2 upgraded from Windows 2008 R2, the domain functional level is Server 2012.
I am able to edit the policy from both a Windows 7 and Server 2008 R2 machine.
The following post is identical however the fix for them does not work for me:
http://social.technet.microsoft.com/Forums/windowsserver/en-US/2d968a05-2cff-4dd0-9c5d-dd810d1fa66f/cant-edit-default-domain-controllers-policy-on-windows-8-or-server-2012
Any ideas?