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M
171
Moderate
MongoDB · Database Server & Atlas
MongoDB server reported: Free Mon Http In Flight.
Quick Answer
Error code 171 on your MongoDB Database Server & Atlas means: MongoDB server reported: Free Mon Http In Flight.. 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 171 (FreeMonHttpInFlight) while processing this request path.
  2. An internal runtime condition interrupted normal command execution.
  3. Server/client state drift caused an unexpected execution-path failure.
How to Fix It
1
Review logs/telemetry for code 171 (FreeMonHttpInFlight) and capture the exact command and parameters that triggered it.
2
Escalate recurring failures with reproducible traces and version/build details.
3
Collect server/client logs with request IDs and stack context for the failing call.
4
Retry once after confirming system health and dependency availability.
5
Add monitoring for recurring FreeMonHttpInFlight events so future incidents are detected and triaged faster.
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Related Error Codes
12456
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