连接到外部数据库时出错 - mysqli_connect(): (HY000/2002): Connection timed out

Question

I moved my database to an external server because the one my webhosting provider offered is just too limited (no remote access). So I set a MariaDB up on a Vultr server (CentOS 7). everything works fine in phpmyadmin and I already imported the other db. When trying to connect from my website I get this warning tho:

Warning: mysqli_connect(): (HY000/2002): Connection timed out in blabla/assets/php/config.php on line 8 ERROR: Could not connect. Connection timed out

PHP code

define('DB_SERVER', '11.22.33.44');
define('DB_USERNAME', 'user');
define('DB_PASSWORD', 'pw');
define('DB_NAME', 'data');

$link = mysqli_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_NAME);

if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}

It worked perfectly fine with the old db so I assume Im missing someting but I can't figure it out. I tried opening the 3306 port, tried different users, allowing all IPs but nothing works.

Answer 1

Thanks for everyone who tried to help but sadly the problem is not on my end. Turned out that one.com also does not allow outgoing connections to other databases than their own.