Active Directory Replication Troubleshooting Runbook

!Issue

Troubleshoot Active Directory replication failures by checking DNS, connectivity, replication status, time synchronization and event logs.

✓Solution

01 Check replication status

★Recommendations

06 Validate convergence After fixing the dependency, rerun replication status commands and confirm the error is no longer recurring.

Run repadmin /replsummary and repadmin /showrepl to identify failing domain controllers and naming contexts.

Check replication status

Confirm domain controllers can resolve each other using the correct AD DNS records. DNS problems are a common dependency for replication.

Verify required network connectivity between domain controllers, including RPC and LDAP paths.

Confirm domain controllers have consistent time and the PDC emulator has the intended authoritative time source.

Check Directory Service, DNS Server and System logs around the replication failure timestamp.

After fixing the dependency, rerun replication status commands and confirm the error is no longer recurring.

Continue with practical infrastructure troubleshooting, PowerShell scripts and operational runbooks.