Fatal error: Uncaught mysqli_sql_exception: Connection refused in /var/www/back/dataBaseInterface.php:16 Stack trace: #0 /var/www/back/dataBaseInterface.php(16): mysqli->__construct() #1 /var/www/model.php(9): ptgDB->__construct() #2 {main} thrown in /var/www/back/dataBaseInterface.php on line 16