Have you tried using the transversal server?
I think so. In 5886 I use the traversal server explicitly. It still doesn't work.
I've been port forwarding for the whole day now, I don't think there is another solution then to change routers. Which makes me sad.
Well it can't be a router problem for me. I plugged directly into the modem and it still didn't work. Try that and see if that works? If so, then it is just a router problem.