You need to portforward.Xampp on my comp
3306 is for MySQL. If you intend to access your database on a separate computer with a separate Internet connection (using IIS and not Xampp) then you can open that port but if you are not going to use it then simply leave it closed.Port-forward the following ports, 80 and 3306 (I don't know if that is accurate but correct me if I'm wrong). If you did so then port-forward the game port and mus port for example, 20 & 21 or 30001 & 30000