Endless Loading screen (Only when connected to my internet)

[Froddoyo 1]

To make it quick and simple. I can play the game, fully functioning and perfect while at my brothers. I get home, and all i get is a endless screen saying loading on it. It will always work at my brothers but when I get home and connect to my own internet (which i can play any other game normally on) It just gives the endless loading screen. Is this a Nat issue or a certain port i must open?

side note: other games always give me a strict Nat and trust me, if i go into the router settings and try to open the Nat my internet completely stops working. why, I have no clue... Should it stop working? No.. welcome to my horrible life were technology is EMP'd by me touching them all the time. I am able to open certain ports when needed though.