Error: could not connect to redis at 127.0.0.1:6379: connection refused

What's Causing This Error

This error message typically indicates that Redis is unable to establish a connection with the specified host and port. The error 'could not connect to Redis at 127.0.0.1:6379: Connection refused' can be caused by a variety of issues, such as:

1. Redis server not running: If Redis is not running or has crashed, it will not be able to accept connections.
2. Firewall blocking connections: If there is a firewall on either the client or server side, it could be blocking incoming/outgoing connections to/from Redis.
3. Incorrect configuration settings: If the Redis configuration file contains incorrect values for the host and port settings, Redis will not be able to establish a connection.

Solution - Here's How To Resolve It

To fix this error, you can try the following solutions along with the specific commands:

1. Ensure Redis is running: Check if Redis is running using the command "redis-cli ping".

redis-cli ping

If it returns "PONG", Redis is running. If it returns "Could not connect to Redis" or "Connection refused", then Redis is not running.

2. Check firewall settings: Use a tool like iptables (on Linux) to ensure that there are no firewall rules blocking Redis connections. You may need to contact your network administrator to check firewall settings.

3. Verify configuration settings: Check the Redis configuration file (redis.conf) to ensure that the correct host and port settings are configured. The default settings are usually 127.0.0.1 and 6379 respectively. You can do this with the cat command followed by the path to the redis.conf file.

cat /path/to/redis.conf

4. Restart Redis: If Redis is running but still encountering connection issues, try restarting the Redis service.

sudo service redis-server restart

5. Use a different port: If the issue persists, try changing the Redis port number in the configuration file to a different value (e.g., 6380) and then restart Redis. You can use nano or vi editor to edit the configuration file.

sudo nano /etc/redis/redis.conf
sudo service redis-server restart

Note: Replace nano with vim if you're more comfortable with vim editor.