Windows error 8451 (ERROR_DS_DRA_DB_ERROR): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The replication operation encountered a directory database error.

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ERROR_DS_DRA_OBJ_IS_REP_SOURCE	ERROR_DS_DRA_NO_REPLICA

ERROR_DS_DRA_DB_ERROR

ERROR_DS_DRA_DB_ERROR (8451) is an Active Directory replication error. The replication engine received a directory database error while applying or reading changes. Investigate underlying Directory Service and storage evidence before treating this as a connection issue.

What to check

Collect the accompanying Directory Service, System, and storage-related events from the affected DC.
Determine whether the database error is isolated to one naming context or prevents all inbound replication.
Avoid unsupported database manipulation; preserve logs and use a supported domain-controller recovery approach if corruption is confirmed.

Useful command

repadmin /showrepl <DestinationDC> /all /verbose

Microsoft: Diagnose AD replication failures · Microsoft: Troubleshoot AD replication problems

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