Error establishing a database connection

In order to resolve the issue you need to check the MySQL database password in config.php file. It should be matched with MySQL. You can resolve this issue by resetting the password some time it will not resolve the issue, so you need to point local host directly to your database. Once you done with this clear the cache and check the website again.

If the issue still persist you need to contact Hosting Service Provider.

Note: You need to reset the database password according to on the config.php file, it will resolve your issue.