Error
Error Code:
303
MongoDB Error 303: Replica Set Connectivity Issue
Description
Error 303, 'Split Horizon Change', indicates a problem with a MongoDB replica set member's ability to correctly resolve or connect to other members. This typically occurs when network addressing or DNS configurations lead to inconsistent views of member locations, preventing proper replica set communication and elections.
Error Message
Split Horizon Change
Known Causes
4 known causesInconsistent Network Addressing
A replica set member advertises an IP address that is not reachable or resolvable by other members, often due to NAT or specific network configurations.
DNS Resolution Discrepancies
Hostnames for replica set members resolve to different IP addresses depending on the querying member's network location, leading to connectivity failures.
Incorrect `bindIp` Configuration
The `net.bindIp` setting on a replica set member restricts connections in a way that prevents other members from establishing necessary communication.
Firewall or Security Group Blocks
Network firewalls or cloud security groups prevent necessary communication ports between replica set members, leading to connection failures.
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