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ERROR_DS_DRA_REF_ALREADY_EXISTS
ERROR_DS_DRA_REF_ALREADY_EXISTS (8448) is an Active Directory replication error. Active Directory already has replication-reference information for the target server where the operation expects to create it. This can indicate stale topology state or a repeated provisioning or decommissioning operation.
What to check
- Inspect the target server, NTDS Settings object, and relevant connection objects in Active Directory Sites and Services.
- Determine whether a previous promotion, removal, or cleanup operation was interrupted.
- Do not delete topology objects only to remove this message; confirm which reference is current and which is stale first.
Useful command
repadmin /showconn <DestinationDC>Microsoft: Repadmin /showrepl · Microsoft: Diagnose AD replication failures · Microsoft: Troubleshoot AD replication problems
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