Fatal error: Uncaught mysqli_sql_exception: Connection refused in /var/www/html/pdf-suite-pro/includes/db.php:18 Stack trace: #0 /var/www/html/pdf-suite-pro/includes/db.php(18): mysqli->__construct() #1 /var/www/html/pdf-suite-pro/signup.php(22): include('...') #2 {main} thrown in /var/www/html/pdf-suite-pro/includes/db.php on line 18