His router is pretty old, its from 2005 (iirc last updated 2007) I think and it doesn't seem to have any updates. But the thing is that the guy can host and we can connect to him but he can't connect to yannick - well technically he can, I guess, but he doesn't see the map in the top right corner and doesn't load into the came when Yannick presses "Start game". We wouldn't like to let him host since he has a weak processor and we can't build walls, like Yannick mentioned before. Any idea what it could be exactly?