It didn't work, too... but I tried something else now:
I created a new charakter, ported to the heartfire of my first charakter - > same Problem
Another new char, who went alone for itself, works fine. I can log in, move, weren't kicked...
Maye the problem lies in the items, charakters, the client must load, which has a problem with the Router..?
Edit: Entering a house still causes disconnect.