Error
Error Code:
255
MongoDB Error 255: Free Monitoring Connection Failure
Description
Error 255, 'Free Mon Http Permanent Failure', indicates that your MongoDB instance is unable to successfully connect and send diagnostic data to MongoDB's free monitoring service. This typically occurs when the database server cannot establish an HTTP connection to the monitoring endpoint, preventing data collection and reporting.
Error Message
Free Mon Http Permanent Failure
Known Causes
4 known causesNetwork Blockage to Monitoring Endpoint
The MongoDB server cannot reach the monitoring service's endpoint due to firewall rules, routing problems, or general network outages.
Incorrect Proxy Settings
If MongoDB is behind a proxy server, misconfigured proxy settings can prevent outgoing HTTP requests to the free monitoring service.
DNS Resolution Failure
The MongoDB server fails to resolve the hostname of the free monitoring service, making it impossible to establish a connection.
Firewall or Security Group Restrictions
Local host-based firewalls or cloud security groups are blocking outbound HTTP/HTTPS traffic from the MongoDB instance.
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