I can't promote a BDC to PDC.

A. If you receive an 'Access Denied' message when attempting topromote a BDC to the PDC it may be due to the fact the PDC has Service Pack 4installed.

This is because Service Pack 4 upgraded the security mechanism used so youwill either have to perform the promotion from a Service Pack 4 domaincontroller or upgrade the BDC in question to SP4.

Another reason for this error is trying to get a renamed and upgraded (3.51to NT4) server to sync with the domain. The accounts database may have becomeout of date and thus couldn't be synchronised. NETLOGON may not even bestartable.

The way round is to do a "connect as" from the PDC to the rogueBDC using an admin ID known to be good by the BDC before it was upgraded. Oncethe "connect as" (say to Cc) was accepted, the BDC would then acceptthe synchronise request from the PDC's Server Manager, restarting NETLOGON inthe process.