How to resolve authorization failure for MySQL users

There could be several reasons for MySQL user authorization failure, here are some solutions:

1. Ensure that the username and password are correct: First, verify that the username and password being used are accurate; it may be a simple input error or the password may have been changed.
2. Check authorization table: Log in to MySQL with an administrator account and verify if the user permissions are properly granted. You can use the following command to view user permissions:

SHOW GRANTS FOR 'username'@'hostname';

1. Authorize user again: If the user’s permissions are incorrect, they can be granted authorization again, for example:

GRANT ALL PRIVILEGES ON database_name.* TO 'username'@'hostname' IDENTIFIED BY 'password';
FLUSH PRIVILEGES;

1. Check IP address restrictions: If the user’s authorization failed, it may be related to the IP address. You can check if IP address restrictions are set.
2. Check the status of the MySQL service to ensure it is running properly and restart it if necessary.
3. Check the firewall settings: Sometimes firewall settings may interfere with MySQL connections, you can try disabling the firewall or modifying the firewall settings.

If the above methods do not solve the problem, you can try to check the MySQL error log for more information, or consult the MySQL official documentation for additional solutions.