What does Windows error code 8466 (ERROR_DS_DRA_EXTN_CONNECTION_FAILED) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: ERROR_DS_DRA_EXTN_CONNECTION_FAILED the server specified for this replication operation was contacted, but that server was unable to contact an additional.

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ERROR_DS_DRA_SOURCE_IS_PARTIAL_REPLICA	ERROR_DS_INSTALL_SCHEMA_MISMATCH

ERROR_DS_DRA_EXTN_CONNECTION_FAILED

ERROR_DS_DRA_EXTN_CONNECTION_FAILED (8466) is an Active Directory replication error. The immediate partner answered, but it depends on another directory server that it could not reach. The broken leg may therefore be one hop beyond the DC that reported the error.

What to check

Inspect repadmin /showrepl on the immediate partner as well as on the destination.
Identify the additional server and naming context named in the related Directory Service events.
Check DNS, RPC reachability, service health, and replication topology for that secondary dependency.

Useful command

repadmin /showrepl <ImmediatePartnerDC> /all /verbose

Microsoft: Diagnose AD replication failures · Microsoft: Troubleshoot RPC error 1722 · Microsoft: Repadmin /showrepl

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