Ensure the user domain name matches the name of a trusted domain that resides in the same forest as the computer account.
Windows could not determine if the user and computer accounts are in the same forest.
The following errors were encountered: The processing of Group Policy failed.
To diagnose the failure, review the event log or run GPRESULT /H from the command line to access information about Group Policy results.
And now that GPUpdate has been straightened out, have you been running GPResult remotely?
Finally, if you want to learn more about Group Policy and how it will make your life easier, then subscribe to Deploy Happiness and get great weekly tips (plus your free guide to the Windows 8 Administrative Start Menu)!
When you do a "gpupdate /force", you see errors like these: "Computer policy could not be updated successfully.
When I first started learning about Active Directory, Group Policy always seemed very fickle.
View the event details for more information on the file name and path that caused the failure.