Active Directory replication failed because the remote system is not available
The replication operation failed because of a system shutdown: The remote system is not available. For information about network troubleshooting, see Windows Help.
Active Directory reported error 1256 when replication could not proceed because the source controller or required network path was not available at the time of the attempt.
The replication operation failed because of a system shutdown: The remote system is not available. For information about network troubleshooting, see Windows Help.
Why it happens
The source domain controller is offline or temporarily unavailable.
An underlying replication dependency such as RPC, DNS, or Kerberos is failing.
The network path between controllers is unavailable during the replication attempt.
How to fix it
Treat error 1256 as a wrapper and identify the paired replication error occurring alongside it.
Check domain controller reachability, network state, and service health on both ends.
Resolve the underlying RPC, DNS, authentication, or endpoint error before retrying replication.
