The error 'unable to connect to Redis Spring Boot' indicates that the application is not able to establish a connection with the Redis server. There could be several reasons behind this error, such as an incorrect configuration, firewall settings, network issues, or problems with the Redis server itself.
One common reason for this error is an incorrect configuration of the Redis properties in the Spring Boot application. If the Redis host and port information is not specified correctly in the application.properties file, the connection will fail. Similarly, if the security group or firewall settings on your server are not configured properly, they may prevent the application from establishing a connection with the Redis server.
To resolve this error, ensure that the Redis server is up and running and that the Redis properties in the application.properties file are configured correctly. Check that the Redis host and port information is accurate and matches the configuration of your Redis server.
If you're using a cloud-based Redis service like AWS Elasticache, ensure that the security group settings allow inbound traffic from your Spring Boot application's IP address. Additionally, check your network connectivity and make sure that there are no network-related issues that could be preventing the connection.
If the problem persists, try connecting to the Redis server using another client, like redis-cli, to verify that the Redis server is configured correctly. Finally, check the logs of your Spring Boot application to see if there are any additional error messages that could provide more insight into what's causing the issue.