I was having issues trying to get gpupdate to work on a RODC in one of our sites. I kept getting an error about: processing of group policy failed to read the GUID\gpt.ini from a domain controller
Then I decided to check the logs and coincidentally came across DFS replication logs and found this:
After backing up my Sysvol directory and editing the registry to resume replication automatically (change the HKLM\System\CurrentControlSet\Services\DFSR\Parameters\StopReplicationOnAutoRecovery registry key to a DWORD value of 0) I ran the command (from admin cmd) exactly as they state in the event properties:
wmic /namespace:\\root\microsoftdfs path dfsrVolumeConfig where volumeGuid=”B4A015E2-A116-11DE-89FB-806E6F6E6963″ call ResumeReplication
I then got this error:
This means that my Sysvol directory has not synced for more than 64 days, and that now the registry setting (which is set to a max of 60 days) is blocking DFS replication from working. So I had to increase the default MaxOfflineTimeInDays:
wmic.exe /namespace:\\root\microsoftdfs path DfsrMachineConfig set MaxOfflineTimeInDays=65
Soon after everything started working and the error logs cleared up.