Depannage serveur Plesk + Centos (ovh)

Suite a un reboot plus d'acces au site et a l'interface plesk sur mon serveur
voici l'affichage actuel
ERROR: PleskFatalException
Unable to connect to database: mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Connection refused

0: common_func.php3:153
psaerror(string 'Unable to connect to database: mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Connection refused')
1: auth.php3:116