Error: redis could not create server tcp listening socket

What's Causing This Error

The error message 'redis could not create server tcp listening socket' highlights that Redis is having trouble binding to the specified TCP port. Several reasons can lead to difficulties in creating a listening socket including:

1. The specified port is already occupied by another process.
2. Redis lacks necessary permissions to bind to the given port.
3. A firewall or security software is blocking the connection.
4. Redis configuration has an invalid IP address.

Your case might also involve a specific situation where the TCP/IP stack of your operating system is in an inconsistent state due to a possible bug or unexpected termination of a process.

Solution - Here's How to Resolve It

Here are some recommendations on how you can resolve this issue:

1. Check if the specified port is in use. Use command netstat -an to see currently occupied ports in your system. If the port is busy, consider using a different port for Redis or terminating the other process utilizing the port.
2. Ensure that Redis has permission to bind to the specified port. In Linux systems, you can run Redis as a privileged user like root to bypass any authorization issues. For instance, sudo redis-server.
3. Analyze if firewalls or security software are blocking the connection. You might need to create an exception for Redis in your firewall rules or temporarily disable your firewall for testing purposes.
4. Verify the IP address in Redis configuration. If you're employing multiple network interfaces or virtual machines, ensure that the IP address Redis is attempting to listen to matches the interface IP address. Check and adjust this in the Redis configuration file (redis.conf).
5. If none of the above solutions work and you are sure that there is no issue with the port being used by another process, you might consider restarting your system. In some rare cases, the TCP/IP stack of an operating system might be in an inconsistent state and a restart could resolve this.

By following these suggestions, you should be able to solve the 'Redis could not create server tcp listening socket' issue and make Redis operational.