The error message 'memcached cannot connect' indicates that the client application is unable to establish a connection with the Memcached server. There are several possible causes for this error, including:
Incorrect server address or port: If the client application is configured with an incorrect server address or port, it will not be able to connect to the Memcached server.
Firewall blocking access: If there is a firewall between the client application and the Memcached server, it may be blocking access to the server, preventing the client from establishing a connection.
Memcached service not running: If the Memcached service is not running on the server or has crashed, the client application will not be able to connect to it.
To resolve the 'memcached cannot connect' error, you can try the following solutions:
Verify the server address and port: Ensure that the client application is configured with the correct server address and port. You can check the configuration file or contact the system administrator to confirm the correct values.
Check the firewall settings: If there is a firewall blocking access, you may need to modify the firewall rules to allow traffic between the client and server. The specific steps for doing this will depend on the type of firewall being used.
Restart the Memcached service: If the Memcached service is not running or has crashed, you can try restarting it. On Linux systems, you can use the command 'service memcached restart' to restart the service. On Windows systems, you can use the Services panel to restart the service.
By taking these steps, you should be able to resolve the 'memcached cannot connect' error and establish a successful connection between the client application and the Memcached server.