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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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