Windows error 8455 (ERROR_DS_DRA_RPC

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The remote procedure call used for replication was cancelled.

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ERROR_DS_DRA_NOT_SUPPORTED	ERROR_DS_DRA_SOURCE_DISABLED

ERROR_DS_DRA_RPC_CANCELLED

ERROR_DS_DRA_RPC_CANCELLED (8455) is an Active Directory replication error. The DRS RPC call began but was cancelled before it completed. Look for the actor that cancelled it: service shutdown, network interruption, timeout, administrative action, or a higher-priority replication task.

What to check

Compare the cancellation timestamp with restarts, firewall changes, network events, and Directory Service events on both DCs.
Check whether the same partner and naming context fail repeatedly or whether cancellations move among partners under load.
Preserve the nested RPC status if present; this DRA code alone does not identify the transport cause.

Useful command

repadmin /showrepl <DestinationDC> /all /verbose

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

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