How to resolve the issue of applications being unable to access Redis after changing the port?

If you have changed the port number of Redis and the application cannot access it, you can follow these steps to resolve the issue:

1. Check the configuration file: make sure you have edited the correct configuration file and restarted the Redis service.
2. Check the firewall: If you have enabled a firewall, it may block the application from accessing the new Redis port. Make sure you have opened the new port.
3. Check access permissions: Ensure that your application has permission to access the new Redis port. You may need to update the application’s connection configuration.
4. Check the network connection: Make sure the network connection is working properly, you can try to test if you can connect to the Redis port by using the telnet command.
5. Check the logs: Review the Redis log files for any error messages to troubleshoot the issue.

If none of the above methods work, consider reverting back to the original port number to see if the issue can be resolved. If the problem persists, further investigation may be necessary or alternative solutions may need to be sought.