Fixing the Redis Connection Refused Error
The “Redis Connection Refused Error” is a common error message in Redis, indicating that a client’s attempt to connect to a Redis server has been denied or rejected. This typically occurs due to issues like the Redis server not running, incorrect connection settings, or firewall restrictions.
Causes of the Redis Connection Refused Error
Redis-Server Not Started
The failure to start the Redis-Server is one of the main reasons why you might get the connection denied error. After installing Redis, the following code must be run to start the Redis server:
redis-server
You can use the following command to start Redis in the background:
redis-server --daemonize yes
Firewall Restriction
A firewall restriction is another thing that can cause the “could not connect to Redis: connection refused” error. The Redis server is set to listen on TCP port 6379 by default. If another program is using this port or if the firewall stops access to it, the connection refused error happens. Checking the status of the port in the firewall setup is a must if you want to solve this problem.
Resource Usage
As was already said, Redis stores data in the main memory of the computer. If the server doesn’t have enough resources for the Redis process to run properly, it may end without warning. When the state of the Redis process is down, the “could not connect to Redis” error is shown. You can use the following command to check if the process is running:
ps -aux | grep redis
Our knowledgeable Support Engineers also look at the Redis log files to see if the service on the server keeps changing. Through a thorough look at other log files, we find any tasks that use a lot of resources and could be causing Redis to end unexpectedly.
Different Reasons
Aside from the above reasons, the connection denied error can also be caused by certain settings in the Redis configuration file. The usual location for the configuration file in Ubuntu 18 is ‘/etc/redis/redis.conf’. Some of the things that could cause this mistake are:
- Redis Password Set in Configuration File: To fix this problem, remove the comments from the following line:
requirepass <some pass if any>
- IP Binding Restriction: If the Redis setup doesn’t allow access to the internet through the IP binding, you can fix the problem by commenting out the following lines:
bind 127.0.0.1::1
By addressing these alternate reasons, you can eliminate the connection failed error and ensure seamless Redis functionality.
Conclusion
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