GPO Policy not updating...

I have a single domain replicating from 2 different sites with a Windows Server 2012 R2 STD domain controllers and Windows 7 and Win 2012 computers joined. It appears that the GPO's are not applying and the GPUPDATE /force hangs and eventually produces this error.

 Computer policy update has not completed in the expected time. Exiting...
 User Policy could not be updated successfully.  The following errors were encountered:

The processing of Group Policy failed. Windows could not resolve the user name.
This could be caused by one of more of the following
a) Name Resolution failure on the current domain controller.
b) Active Directory Replication Latency (an account created on another domain controller has not replicated to the current domain controller).

To diagnose the failure, review the event log or run GPRESULT /H GPReport.html from the command line to  access information about Group Policy Results.

Need some solutions.

AnagkazoSystems EngineerAsked:
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Robin CMSenior Security and Infrastructure EngineerCommented:
Can the member machines (Win7 & 2012) contact the DCs? Do they have valid IP addresses, DNS server settings?
Can you resolve your AD name via DNS with nslookup from the problem machines?
Check the solution here:
There's also some info here, note the comment at the bottom about disabling IPv6 (if you don't need it):

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AnagkazoSystems EngineerAuthor Commented:
Got it resolve.  Just discovered our network guys made changes firewall changes to the network.  Network was timing out causing DNS resolution problems.

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