When you run DCPromo.exe, the Active Directory Installation Wizard, you receive:
RPC Server is too busy.
The DCPromo.log file contains information similar to:
07/11 12:43:30 \[INFO\] Configuring the local server to host the Directory Service
07/11 12:43:36 \[INFO\] Replicating the Directory Service schema container
07/11 12:43:41 \[INFO\] Error - The Directory Service failed to replicate the partition CN=Schema,CN=Configuration,DC=ds,DC=<domain>,DC=<com> from remote server <ServerName>.<Domain>.<com>. (1723)
07/11 12:43:42 \[INFO\] NtdsInstall for <ServerName>.<Domain>.<com> returned 1723
07/11 12:43:42 \[INFO\] DsRolepInstallDs returned 1723
If the time on the server being promoted is NOT within 5 minutes of the time on the domain controller that will provide the Active Directory information, you will experience this behavior.
NOTE: The Kerberos protocol requires that these servers have time settings that are within 5 minutes of each other.