Fatal error: Uncaught PDOException: SQLSTATE[HY000] [2002] Connection refused in /var/www/html/libraries/database/pdo.php:27 Stack trace: #0 /var/www/html/libraries/database/pdo.php(27): PDO->__construct('mysql:host=171....', 'tlh_toan', 'dsefdgg43@tlh', Array) #1 /var/www/html/libraries/database/pdo.php(18): FS_PDO->connect() #2 /var/www/html/index.php(35): FS_PDO->__construct() #3 {main} thrown in /var/www/html/libraries/database/pdo.php on line 27