Bonjour , j' ai une erreur de connexion de db sur mon site:

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2003] Can't connect to MySQL server on 'ipdb' (113)' in /home/fla/public_html/Source/includes/db.php:7 Stack trace: #0 /home/fla/public_html/Source/includes/db.php(7): PDO->__construct('mysql:host=85.1...', 'root', 'psw') #1 /home/fla/public_html/Source/login.php(2): require('/home/fla/...') #2 {main} thrown in /home/fla/public_html/Source/includes/db.php on line 7
Contenu "db.php"
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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<?php
define('DB_HOST', 'monipdb');
define('DB_NAME', 'test');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', 'psw');
 
$odb = new PDO('mysql:host=' . DB_HOST . ';dbname=' . DB_NAME, DB_USERNAME, DB_PASSWORD);
?>
Que faire?