ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost:3306' (10061)

This error message indicates that the client application is unable to establish a connection with the MySQL server running on the local machine at port number 3306. The error code 10061 suggests that the connection was refused by the server, possibly due to incorrect login credentials, firewall restrictions, or server configuration issues.

To resolve this error, you can try the following steps:

1. Check if the MySQL server is running: Use the command "service mysql status" (Linux) or "net start mysql" (Windows) to check if the MySQL server is running. If it is not running, start the server using "service mysql start" (Linux) or "net start mysql" (Windows).

2. Verify the login credentials: Make sure that you are using the correct username and password to connect to the MySQL server. You can try logging in to the server using the command line client to verify the credentials.

3. Check firewall settings: Ensure that the firewall on the server allows incoming connections on port 3306. You can add a firewall rule to allow incoming connections on this port.

4. Check the MySQL configuration file: Verify the configuration settings in the MySQL configuration file (my.cnf or my.ini) to ensure that the server is listening on the correct port and IP address.

If none of the above steps resolve the issue, you may need to seek assistance from a professional MySQL database administrator.