erro db

running the command to restore ab DB backup brings me to this: zcat mysql.daily.dump.8.gz | plesk db ERROR 2013 (HY000): Lost connection to MySQL server at 'reading initial communication packet', system error: 104 exit status 1

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...