Every 5 minutes on a domain controller, or every 20 minutes on a member server, your Event log records:

Userenv 1000                              Windows cannot access the registry information at                              \\<domainname.com>\sysvol\<domainname.com>\Policies\{ file://\\<domainname.com>\sysvol\<domainname.com>\Policies\{31B2F340-016D D-11D2-945F-00C04FB984F9\}\Machine\registry.pol with (1398).                               SceCli 1001                               Security policy cannot be propagated. Cannot access the template. Error code=3.                               Userenv 1000                               The Group Policy client-side extension Security was passed flags (17) and returned a failure status code of (3).                               NtFrs 13508                               Description: The File Replication Service is having trouble enabling replication from <computername>                              to <computername> for c:\winnt\sysvol\<domain>; retrying.
To resolve this problem, synchronize the computer's clock with the domain controller that is the authoritative time server.

For each server that is experiencing this difficulty, open a CMD prompt and type:

net time \\ComputerName_Of_Authoritative_Time_Server /set /y                              net stop ntfrs                               net start ntfrs