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MongoDB · Database Server & Atlas
MongoDB server reported: Write Concern Timeout.
Quick Answer
Error code 64 on your MongoDB Database Server & Atlas means: MongoDB server reported: Write Concern Timeout.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
MONGO-ATLAS-DEDICATEDMONGO-ATLAS-SERVERLESSMONGO-COMM-6.0MONGO-COMM-7.0MONGO-COMM-8.0MONGO-ENT-6.0MONGO-ENT-7.0MONGO-ENT-8.0
Likely Causes
  1. MongoDB returned code 64 (WriteConcernTimeout) while processing this request path.
  2. Cluster topology changed during execution (primary step-down, shard movement, or stale metadata).
  3. Replication or sharding state was not aligned with the operation preconditions.
How to Fix It
1
Review logs/telemetry for code 64 (WriteConcernTimeout) and capture the exact command and parameters that triggered it.
2
Gate retries on a stable cluster view and avoid stale routing caches.
3
Refresh topology metadata and retarget the command using current primary/shard ownership.
4
Review replication/sharding events around the timestamp to confirm role transitions.
5
Add monitoring for recurring WriteConcernTimeout events so future incidents are detected and triaged faster.
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Related Error Codes
12456
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