What does Windows error code 8439 (ERROR_DS_DRA_BAD_DN) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The distinguished name used by the replication operation is invalid.

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ERROR_DS_DRA_BUSY	ERROR_DS_DRA_BAD_NC

ERROR_DS_DRA_BAD_DN

ERROR_DS_DRA_BAD_DN (8439) is an Active Directory replication error. The replication request refers to a distinguished name that is malformed, no longer valid in the expected naming context, or does not identify the intended directory object.

What to check

Check the naming context and distinguished name recorded by the failing replication operation.
Confirm the object still exists on the expected source and has not been renamed, moved, or deleted during the workflow.
For automation, escape commas, plus signs, and other DN-special characters correctly rather than constructing paths by string concatenation.

Useful command

repadmin /showrepl <DestinationDC> /all /verbose

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

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