What does Windows error code 8437 (ERROR_DS_DRA_INVALID_PARAMETER) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: An invalid parameter was supplied to the Active Directory replication operation.

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ERROR_DS_DRA_INVALID_PARAMETER

ERROR_DS_DRA_INVALID_PARAMETER (8437) is an Active Directory replication error. A replication operation received a value that is invalid for the requested DRS action. This is commonly associated with a malformed request, an incorrect naming-context reference, or a tool or version mismatch.

What to check

Record the exact command, API caller, source DC, destination DC, and naming context that produced the error.
Validate the distinguished names and server names passed to administrative tools instead of retrying with altered parameters at random.
If the request comes from automation, compare it with a successful request against the same directory partition.

Useful command

repadmin /showrepl <DestinationDC> /all

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

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