Software⏱️ 4 min read📅 2026-06-15

How to Fix: redis Error: Server closed the connection

Redis server closed connection issue in cluster setup

Quick Answer: Check Redis configuration, ensure proper master-slave replication and verify node connections.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

The error 'Server closed the connection' is affecting one master node and its slave in a Redis cluster, causing issues with communication between the two. This error can be frustrating as it prevents data from being successfully written to the Redis instance.

In this situation, we will guide you through steps to troubleshoot and potentially resolve the issue.

⚠️ Common Causes

  • The primary reason for this error is likely due to a misconfiguration or issue with the connection between the master node and its slave. This could be caused by a variety of factors such as incorrect Redis configuration, network connectivity issues, or software conflicts.
  • An alternative cause could be a problem with the Redis server itself, such as a hardware failure or a software bug.

✅ Best Solutions to Fix It

Restarting the Redis Server

  1. Step 1: Step 1: Stop any running Redis services on the affected node to prevent further data corruption. This can usually be done by stopping the service with the command 'sudo systemctl stop redis' (on Linux) or 'net stop redis' (on Windows).
  2. Step 2: Step 2: Check if there are any network connectivity issues between the master and slave nodes. Ensure that both nodes have a stable internet connection and that the Redis port is not blocked by firewalls or other security software.
  3. Step 3: Step 3: Restart the Redis server on the affected node with the command 'sudo service redis-server restart' (on Linux) or 'net start redis' (on Windows).
  4. Step 4: Step 4: Verify that the Redis instance has started successfully and that it is responding correctly to client connections. This can be done by checking the Redis logs for any errors or issues.
  5. Step 5: Step 5: Test data writing to the Redis instance from a client application to ensure that the issue has been resolved.

Checking Redis Configuration

  1. Step 1: Step 1: Check the Redis configuration files on the affected node to ensure that they are correctly set up for cluster mode. This includes verifying that the 'cluster-enabled' option is set to 'yes' and that the 'cluster-node-timeout-ping' option is set to a reasonable value.
  2. Step 2: Step 2: Review the Redis configuration logs to identify any errors or issues that may be contributing to the problem. These logs can provide valuable insights into what went wrong and how to resolve it.
  3. Step 3: Step 3: Verify that the Redis server is configured correctly for the cluster mode, including verifying that the 'cluster-node' option is set to the correct IP address of the slave node.

💡 Conclusion

In summary, the error 'Server closed the connection' in a Redis cluster can be caused by misconfiguration or issues with the connection between nodes. By following these steps, you should be able to identify and resolve the issue, ensuring that your data is written successfully to the Redis instance.

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