io.lettuce.core.RedisConnectionException: Unable to connect to

Redis

There could be several reasons why you are getting this exception:

1. Redis server is not running: Make sure that the Redis server is up and running. You can use the `redis-cli ping` command to check if the server is running.

2. Incorrect Redis configuration: Check if the Redis configuration is correct. Make sure that the Redis server is listening on the correct IP address and port.

3. Firewall or security settings: Check if the firewall or security settings are blocking the connection to Redis. Make sure that the Redis port is open and accessible.

4. Network issues: Check if there are any network issues between your application and Redis server. You can use tools like `ping` or `traceroute` to diagnose network issues.

5. Authentication issues: Check if the Redis server requires authentication. Make sure that you are providing the correct username and password.

6. Redis server overload: Check if the Redis server is overloaded with too many requests. You can use tools like `redis-cli info` to check the Redis server status.

To resolve the issue, you can try the following:

1. Check if the Redis server is running and listening on the correct IP address and port.

2. Check if the firewall or security settings are blocking the connection to Redis.

3. Check if there are any network issues between your application and Redis server.

4. Check if the Redis server requires authentication and provide the correct credentials.

5. Check if the Redis server is overloaded and try to reduce the load.