RPC/RSAT Access Denied Errors
One admin gets error 5 from repadmin and dcdiag on every writable domain controller while others are fine. Cause and fix, including RPC filters that block a single account.
Check AD replication health
Use repadmin and dcdiag to check Active Directory replication between domain controllers.
repadmin Access is denied
Troubleshoot repadmin and Active Directory Sites and Services errors that return Access is denied (error 5).