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MongoDB · Database Server & Atlas
MongoDB server reported: Session Transfer Incomplete.
Quick Answer
Error code 146 on your MongoDB Database Server & Atlas means: MongoDB server reported: Session Transfer Incomplete.. 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 146 (SessionTransferIncomplete) while processing this request path.
  2. Atomic commit/abort guarantees could not be upheld for the in-flight operation.
  3. Transaction coordinator state changed, forcing retry or rollback logic.
How to Fix It
1
Review logs/telemetry for code 146 (SessionTransferIncomplete) and capture the exact command and parameters that triggered it.
2
Load full transaction/session trace to identify the exact conflicting transition.
3
Retry the whole transaction flow (not partial fragments) with idempotent boundaries.
4
Review coordinator logs to distinguish retriable aborts from terminal state conflicts.
5
Add monitoring for recurring SessionTransferIncomplete 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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