How can i host games in Warcraft 3?

What website do i go to to open the ports up? And how do i do it? Plz id love to host games so any help would be very apreciated. P.S i have hosted games before in the past but something just happened and i cant host anymore.

portforward.com Or you can go to your router and/or firewall settings yourself and open the port 6112. Open both TCP and UDP of 6112