What does NTSTATUS 0xC000A080 (STATUS_LOST_WRITEBEHIND_DATA_NETWORK_DISCONNECTED) mean?

 
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STATUS_FASTPATH_REJECTED STATUS_LOST_WRITEBEHIND_DATA_NETWORK_SERVER_ERROR

STATUS_LOST_WRITEBEHIND_DATA_NETWORK_DISCONNECTED

Delayed write-back failed after the network path disconnected

This variant identifies loss of connectivity while Windows was flushing buffered data to remote storage. The original write may already have returned success, but the server never received all dirty data.

Do not treat reconnecting the share as proof that the file is complete. Compare application-level lengths, checksums, or transaction logs on both sides. Investigate link resets, VPN or routing changes, SMB session expiry, and failover timing around the flush.

What to inspect

  • Preserve client and server SMB and network events.
  • Verify the remote file contents after connectivity returns.
  • Use application transactions or explicit flushes for data that requires durable acknowledgement.

References

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