Using AD 2012 - do a Group Policy Update from the Group Policy MMC to all servers in the Domain and I get the eror :-
Computer Name , 8007071a , Error The Romote procedure call was cancelled.
Not sure if it stops the polcy being pushed out to the server. I have looked at the link to check what ports are needed open from the the DC's. All seemed covered as in the list in the link below
http://technet.microsoft.com/en-gb/library/dd772723%28v=ws.10%29.aspx
Appreciate if soemone have enlighten me how to resolve this and what is NOT beign replicated