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I'm unable to login to my Plesk control panel, or even pull up the page.

Plesk's repair utilities fail to work, so web/GUI methods seem to be entirely unavailable.

The only way I can login is via command:

mysql -u admin -p [entering correct password]

But Plesk itself cannot connect to MYSQL 5.7, because it's using whatever the old password was.

How do I update the password that Plesk uses to connect to MySQL?

Pointers for updating the Plesk MySQL password

1. According to the "The Plesk shows the error: Cannot connect to MySQL 4.1+ using the old insecure authentication" post, you can go to Plesk > Domains > example.com > Databases > User Management > database_name and in the the new window submit the new password.




2. Additionally, according to the "Plesk is not accessible: Access denied for user 'username' @'localhost' (using password YES)" post, you can run plesk sbin psadb -u --password="password" with the new password from command line.

Additional Resources & References

• Updating MySQL Pre-4.1 Password Hashes to be MySQL 5.6 Compatible


• The Plesk shows the error: Cannot connect to MySQL 4.1+ using the old insecure authentication


• Plesk is not accessible: Access denied for user 'username' @'localhost' (using password YES)

Following the instructions on a link shared by Pimp Juice's answer, Typing plesk db gave me the error: ERROR 1045 (28000): Access denied for user 'admin'@'localhost' (using password: YES)

The solution was to combine the two, as I can't find a documented way that plesk db allows username and password options

1. Run mysql: mysql -u admin -p MyMySQLAdminPassword, which is what plesk db was trying to do with the credentials it knows.


2. Paste the command UPDATE mysql.user SET authentication_string=PASSWORD("MyMySQLAdminPassword") WHERE user='admin';
   


3. 
   quit MYSQL


4. Run the command: plesk sbin psadb -u --password="MyMySQLAdminPassword", quotes included.