Error
Error Code:
172
MongoDB Error 172: Connection Lost Unexpectedly
Description
Error 172, 'Transport Session Closed', signifies that the network connection between a MongoDB client and the server was unexpectedly terminated. This interruption prevents further communication and operations, often leading to failed queries or application crashes. It typically occurs when an active session is abruptly broken.
Error Message
Transport Session Closed
Known Causes
4 known causesUnstable Network Connection
Intermittent network drops, high latency, or unreliable network infrastructure can prematurely close the active transport session between the client and the MongoDB server.
Client Application Crash or Timeout
If the client application crashes, explicitly closes the connection, or exceeds a configured connection timeout without activity, the session will be terminated by the client or connection pool.
Server Overload or Restart
A MongoDB server restart, resource exhaustion (like too many open connections), or a server-side process crash can force active client sessions to close unexpectedly.
Firewall or Proxy Interruption
Network devices such as firewalls or proxies can terminate idle or long-running connections if they detect suspicious activity or enforce strict timeout policies.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service