error: plesk dbexception

Sometime ago I started getting these errors on my Plesk server, all my database users are "absent". error The user REDACTED on the subscription REDACTED is absent from the database server. failed Recreating the user REDACTED on the subscription X SQLSTATE[HY000]: General error: 1396...

I am getting the following error after trying to restart the server with Plesk: ERROR: PleskDBException: Unable to connect to database: mysql_connect(): Connection refused /var/lib/mysql/mysql.sock (Error code: 2002). Please check that database server is started and accessible...