Can't connect to MySQL server on 'localhost'

There could be several reasons why you are unable to connect to the MySQL server on 'localhost'. Here are a few possible solutions you can try:

1. Check if the MySQL server is running: Make sure that the MySQL server is up and running on your localhost. You can check the status of the server by running the command `service mysql status` or `systemctl status mysql` (depending on your operating system).

2. Verify the connection parameters: Double-check the connection parameters such as the host, port, username, and password. Ensure that you are using the correct values to establish the connection.

3. Check the firewall settings: If you have a firewall enabled on your machine, make sure that it allows incoming connections on the MySQL port (default is 3306). You may need to configure your firewall to allow access to the MySQL server.

4. Verify MySQL server permissions: Ensure that the user you are trying to connect with has the necessary privileges to access the MySQL server from 'localhost'. You can use the `GRANT` statement to grant appropriate permissions if needed.

5. Restart the MySQL server: Sometimes, restarting the MySQL server can resolve connectivity issues. You can do this by running the command `service mysql restart` or `systemctl restart mysql`.

If none of these solutions work, please provide more information about your setup and any error messages you are encountering for further assistance.