Windows error 8331 (ERROR_DS_CANT_MIX_MASTER_AND

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The object and its parent cannot be mixed between master and replica naming-context types.

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ERROR_DS_PARENT_IS_AN_ALIAS	ERROR_DS_CHILDREN_EXIST

ERROR_DS_CANT_MIX_MASTER_AND_REPS

ERROR_DS_CANT_MIX_MASTER_AND_REPS (8331) is an Active Directory Domain Services error. The requested operation would place an object and its parent in incompatible master-versus-replica naming-context roles. This is a directory partition topology issue, not a normal object-management error.

What to check

Identify the naming context that owns the object and the naming context of the proposed parent.
Verify whether the target server hosts a writable replica or only a partial/read-only replica.
Correct the target partition or topology rather than attempting a direct move across incompatible replicas.

Useful command

repadmin /showrepl "<DomainController>" /all /verbose

Microsoft: Diagnose AD replication failures · Microsoft: Directory Service system error codes · Microsoft: DCDiag

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