Causes of AD replication issues

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Causes of Active Directory replication issues

1. Network connectivity: The network connection might be unavailable or network settings are not configured properly.

2. Name resolution: incorrect DNS configurations are a common cause for replication failures.

3. Authentication and authorization: Authentication and authorization problems cause "Access denied" errors when a domain controller tries to connect to its replication partner.

4. Directory database (store): The directory database might not be able to process transactions fast enough to keep up with replication timeouts.

5. Replication engine: If inter-site replication schedules are too short, replication queues might be too large to process in the time that is required by the outbound replication schedule. In this case, replication of some changes can be stalled indefinitely — potentially, long enough to exceed the tombstone lifetime.

6. Replication topology: Domain controllers must have inter-site links in Active Directory that map to real wide area network (WAN) or virtual private network (VPN) connections. If you create objects in Active Directory for the replication topology that are not supported by the actual site topology of your network, replication that requires the misconfigured topology fails.

7. Time synchronization: If domain controllers' time doesn't synchronize, the File Replication may fail.