Windows error 8477 (ERROR_DS_DRA_REPL

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The replication request has been queued or posted and has not yet produced its final result.

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ERROR_DS_WRONG_OM_OBJ_CLASS	ERROR_DS_DS_REQUIRED

ERROR_DS_DRA_REPL_PENDING

Replication is pending, not necessarily failed

Active Directory replication is a multi-step distributed operation. A request can be accepted by the replication engine and remain pending while the source, destination, and NC-specific replication cycle progresses. This status should not be interpreted as a final transport or data-consistency failure by itself.

The important evidence is what happens next: whether the pending request completes, accumulates repeated failures, or remains blocked behind another replication problem. Automation that converts every nonzero status into an immediate retry can create noise and obscure the actual final code returned by later replication diagnostics.

What to inspect

Record the source DC, destination DC, naming context, request time, and eventual final result as one operation.
Use replication status tools to inspect consecutive failure count and last-success time instead of repeatedly posting the same request.
If the state persists, examine the surrounding replication queue, RPC/DNS health, and Directory Service events for the blocking operation.

References

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