Group Policy not work in some client machine.

Question

Hello All,
Existing environment is AD 2012. gpupdate /force command does not working in some client machine. And it's occur randomly. Error shown about 15-20% of client machine. Please suggest. Hopefully this time get reply from community.
The Error:
User policy could not be updated successfully. The following errors were encount
ered:
The processing of Group Policy failed. Windows attempted to read the file \\example.net\sysvol\example.net\Policies\{31B2F340-016D-11D2-945F-00C04FB
984F9}\gpt.ini from a domain controller and was not successful. Group Policy set
tings may not be applied until this event is resolved. This issue may be transie
nt and could be caused by one or more of the following:
a) Name Resolution/Network Connectivity to the current domain controller.
b) File Replication Service Latency (a file created on another domain controller
 has not replicated to the current domain controller).
c) The Distributed File System (DFS) client has been disabled.
Computer policy could not be updated successfully. The following errors were enc
ountered:
The processing of Group Policy failed. Windows attempted to read the file \\example.net\sysvol\example.net\Policies\{31B2F340-016D-11D2-945F-00C04FB
984F9}\gpt.ini from a domain controller and was not successful. Group Policy set
tings may not be applied until this event is resolved. This issue may be transie
nt and could be caused by one or more of the following:
a) Name Resolution/Network Connectivity to the current domain controller.

Answer 1

Thanks for your reply. basically this error occurs with in same location as well as branch location. i have check event log in AD but not got any specific error. AD health status is ok. AD to AD synchronization also working well. All the client machine running
on windows 7 64 bit and few of them are windows 8. 
Please suggest. if you need any event log for analysis i can send you.
Thanks
I recommend you examine the event logs upon an affected client machine. Specifically, look for the surrounding events on that machine (both System, and Application logs), for the hours previous and the hour after.
The time period may vary according to your environment (e.g. what is expected/normal for your environment, your configured GP refresh cycle-time).
e.g., are there network drops, or power drops, or system crashes, restarts at the similar time.
if it's a laptop, is it wireless? Was there a transition from wireless to wired operation?
Is there VPN in use?
If you are able to compare with another machine (I would encourage that), to understand what "normal" looks like in the logs, so that you have some kind of baseline data for comparison.
Other checks, maybe confirm that the machines are updating as required (have the relevant WindowsUpdates etc), and consider if some security/protection/firewall software might be interfering with normal Windows operations.
Also the potential for malware or virus, which can disturb many basic services (ensure a scan is performed and returns clean).
If you have the opportunity for an affected user to contact you urgently when the symptom occurs, check that the gpt.ini file is accessible from their PC.
e.g.: \\example.net\sysvol\example.net\Policies\{31B2F340-016D-11D2-945F-00C04FB
984F9}\gpt.ini
This file is hosted within the replicated SYSVOL share on your DC's, so check that it is accessible.
You might also validate the particular GPO this refers to, and check each of your DC's holds the correct copy of the files for that GPO GUID.
If you open that GPO, and perform a minor change to it (e.g. add a comment), then click Apply, OK, this should cause the GPO contents to replicate an updated version (be cautious, depending upon the nature of that GPO !!!)
Don
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