I even tried the disable UpnP in-game. I tried it check and unchecked and people still can't join.
My dad did the whole port-forwarding. I told him that ports 28000 and 28030 were the ones that needed opening. After that, he told me if it's 28000 AND 28030, or if it's 28000 TO 28030. I guessed it was TO.
Did I guess wrong at that last part, or is there something else that needs to be done?