Memcached CLIENT_ERROR invalid port number

The port number provided is not valid.

Understanding Memcached

Memcached is a high-performance, distributed memory object caching system. It is primarily used to speed up dynamic web applications by alleviating database load. By caching data and objects in RAM, Memcached reduces the number of times an external data source (such as a database or API) must be read.

Identifying the Symptom: CLIENT_ERROR invalid port number

When using Memcached, you might encounter the error message: CLIENT_ERROR invalid port number. This error typically appears when attempting to connect to a Memcached server using an incorrect port number.

What You Observe

The application or client attempting to connect to Memcached fails, and the error message is logged or displayed, indicating an invalid port number.

Explaining the Issue: Invalid Port Number

The error CLIENT_ERROR invalid port number suggests that the port number specified for the Memcached server connection is not valid. Memcached typically runs on port 11211, but it can be configured to use a different port. An invalid port number can be outside the acceptable range (1-65535) or already in use by another service.

Common Causes

  • Typographical errors in the port number.
  • Port number is outside the valid range.
  • Port number is already in use by another application.

Steps to Fix the Issue

To resolve the CLIENT_ERROR invalid port number, follow these steps:

1. Verify the Port Number

Ensure that the port number you are using is correct and matches the configuration of the Memcached server. The default port is 11211, but it may be different if configured otherwise.

telnet localhost 11211

This command checks if the Memcached server is running on the default port.

2. Check Port Availability

Use the following command to check if the port is already in use:

netstat -tuln | grep 11211

If the port is in use by another service, you will need to either stop that service or configure Memcached to use a different port.

3. Update Configuration

If the port is incorrect, update your application's configuration to use the correct port. This might involve editing a configuration file or setting an environment variable.

Additional Resources

For more information on configuring Memcached, refer to the official Memcached documentation. You can also explore Memcached's GitHub Wiki for community-driven insights and troubleshooting tips.

By following these steps, you should be able to resolve the CLIENT_ERROR invalid port number and ensure a successful connection to your Memcached server.

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