Have you checked if you have a firewall running

For example in Ubuntu you can run

sudo ufw status verbose

I think it’s correct. https://i.gyazo.com/185106e96229ea1291646321186324aa.png

That will be it,

The default is to deny all incoming. And you don’t have a rule for MySQL Port 3306.

sudo ufw allow 3306/tcp
sudo service ufw restart

Please note this is not adviced to open MySQL to the whole internet. If you need this and can, you could limit to a fixed IP on the firewall

Thank you so much! This solved it.

Your welcome,

Please listen to mine and @Woet advice though and don’t do this.

MySQL is not going to be secured.