Follow this list of steps to troubleshoot Active Directory replication errors:

1. Check the Event Viewer logs – both the directory services and system log will regularly report any replication-related errors.


2. Check the DNS settings – make sure the correct records are registered and that DNS setup is correctly configured.


3. Check the server and connections – server responsiveness, server load, and replication related errors in the console should be checked.


4. Verify the data being replicated – investigate the data sets being replicated to ensure they are what’s expected.


5. Compare replication settings between sites – compare the replication settings between sites to ensure they match.