What does Windows error code 8438 (ERROR_DS_DRA_BUSY) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The directory service was too busy to complete replication at that time.

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ERROR_DS_DRA_INVALID_PARAMETER	ERROR_DS_DRA_BAD_DN

ERROR_DS_DRA_BUSY

ERROR_DS_DRA_BUSY (8438) is an Active Directory replication error. The destination directory service could not schedule the replication work immediately. This indicates pressure or queueing, not necessarily a broken replication topology.

What to check

Inspect the inbound replication queue and compare it over time instead of acting on one sample.
Check CPU, memory, disk latency, and network throughput on the affected domain controller during the failure window.
Review whether a large number of partners, high object churn, or scheduled jobs are concentrating replication work in the same period.

Useful command

repadmin /queue <DestinationDC>

Microsoft: Repadmin /queue · Microsoft: Troubleshoot slow AD replication · Microsoft: Diagnose AD replication failures

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