Windows error 8450 (ERROR_DS_DRA_OBJ_IS_REP

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The naming context cannot be removed because it is still replicated to another server.

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ERROR_DS_DRA_REF_NOT_FOUND	ERROR_DS_DRA_DB_ERROR

ERROR_DS_DRA_OBJ_IS_REP_SOURCE

ERROR_DS_DRA_OBJ_IS_REP_SOURCE (8450) is an Active Directory replication error. A naming context is still a replication source for another server, so Active Directory blocks its removal. This protects partners from losing a required replica unexpectedly.

What to check

Identify every remaining replica and connection that depends on the naming context before starting removal or decommissioning work.
Verify replication health first; removing a source while partners are stale can create a harder recovery problem.
Follow a supported decommission sequence instead of deleting cross-reference or NTDS objects manually.

Useful command

repadmin /showrepl <SourceDC> /all /verbose

Microsoft: Diagnose AD replication failures · Microsoft: Troubleshoot AD replication problems · Microsoft: Repadmin /showrepl

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