What does Windows error code 8407 (ERROR_DS_CANT_RETRIEVE_INSTANCE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The directory service could not retrieve an object instance-type attribute.

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ERROR_DS_CANT_RETRIEVE_INSTANCE

ERROR_DS_CANT_RETRIEVE_INSTANCE (8407) is an Active Directory Domain Services error. The directory service failed while reading the internal instanceType information used to describe the role of an object within a naming context. Treat this as a directory-state or replication diagnostic, not as an attribute that a script should repair directly.

What to check

Identify the DC, naming context, and object involved in the failed operation.
Check Directory Service events and replication status for related partition or database errors.
Verify that the targeted DC hosts the expected writable or partial replica.

Useful command

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

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

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