Problem connecting PHP site to external MariaDB

Website URL

http://himalia-stock.infinityfree.me/

Error Message

Erreur de connexion : SQLSTATE[HY000] [2002] Connection timed out

Other Information

I want to create a PHP website that connects to an external database. When I create a PHP page with a database connection test, I get this error even though my database is accessible externally. Is access to the external database blocked?