Fatal error: Uncaught mysqli_sql_exception: Connection refused in /opt/Apps/app/config/db.php:16 Stack trace: #0 /opt/Apps/app/config/db.php(16): mysqli->__construct() #1 /opt/Apps/app/shipping/shipping_db.php(3): require_once('...') #2 /opt/Apps/app/shipping/shipping.php(2): require_once('...') #3 /opt/Apps/app/shipping/index.php(2): require_once('...') #4 {main} thrown in /opt/Apps/app/config/db.php on line 16