What does Windows error code 8418 (ERROR_DS_DRA_SCHEMA_MISMATCH) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The replication partners have incompatible Active Directory schema definitions.

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ERROR_DS_GCVERIFY_ERROR	ERROR_DS_CANT_FIND_DSA_OBJ

ERROR_DS_DRA_SCHEMA_MISMATCH

ERROR_DS_DRA_SCHEMA_MISMATCH (8418) is an Active Directory replication error. The source has objects or attributes that the destination cannot interpret because their schema partitions differ. Treat this as a schema-replication problem before investigating individual directory objects.

What to check

Use repadmin /showrepl on both domain controllers to identify the first failing schema-partition replication and the exact partner pair.
Verify which domain controller owns the Schema Master role and whether schema changes completed on every writable domain controller.
Do not edit schema objects manually to make the error disappear; capture the partner, naming context, and first schema-related event before making a repair plan.

Useful command

repadmin /showrepl <DestinationDC> /all /verbose

Microsoft: Troubleshoot AD replication error 8418 · Microsoft: Repadmin /showrepl · Microsoft: Diagnose AD replication failures

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