How to syncronize a non-domain server to a domain-controller’s clock

Jeff, I found this article. Might be of some help to you. You might have already read this but I thought it was worth a shot.

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Config\AnnounceFlags

This registry entry controls whether the local computer is marked as a reliable time server (which is only possible if the previous registry entry is set to NTP as described above). Change this REG_DWORD value from 10 to 5 here.

UPDATE As per Jeff, best source of reference is http://support.microsoft.com/kb/816042

This is going to sound crazy but only because I did this to myself once. Check and be sure there are no firewalls or network issues. I had one network once where I accidently had the windows firewall turned on, on one of the DC's (there were 4), so because this DC wasn't replicating properly I couldn't do any AD upgrades. Though the rest of the network was working fine so there were no symptions until I tried to update the schema in my case.

Simple test, make sure each DC can ping every other DC and that all DNS is resolving properly. Also ensure the AD is in the highest that Windows 2000 can go, I'm not sure how backwards compatiable 2008 is as a DC.