Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2002] Connection refused' in /mnt/data/www/haoxuehaozhi/haoxuehaozhi/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:43 Stack trace: #0 /mnt/data/www/haoxuehaozhi/haoxuehaozhi/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php(43): PDO->__construct('mysql:host=39.1...', 'root', 'MyRootUser_1234', Array) #1 /mnt/data/www/haoxuehaozhi/haoxuehaozhi/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php(45): Doctrine\DBAL\Driver\PDOConnection->__construct('mysql:host=39.1...', 'root', 'MyRootUser_1234', Array) #2 /mnt/data/www/haoxuehaozhi/haoxuehaozhi/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(360): Doctrine\DBAL\Driver\PDOMySql\Driver->connect(Array, 'root', 'MyRootUser_1234', Array) #3 /mnt/data/www/haoxuehaozhi/haoxuehaozhi/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(429): Doctrine\DBAL\Connection->connect() #4 /mnt/data/www/haoxuehaozhi/haoxuehaozhi/vendor/doctrine/dbal/lib/Doctrine/D in /mnt/data/www/haoxuehaozhi/haoxuehaozhi/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php on line 103