I'm having somewhat the same problem with a friend of mine.
i've been trying all week to fix it
we now have the same kernel ,same dashlaunch both on same TU and we both have a stable connection.
when we both loggin for the first time ,we can see eachother and we can join.
but after about half a minute one of us gets kicked and for some reason we can't join eachothers game anymore.
another strange thing...he can't make a room.
we both reset our routers and modems,nothing seems to make a difference
the annoying thing is when we played (Diablo 3 )in the past we didn't have any problems.
and when we're on our PS3 we don't have any problems.
does anyone know how to fix this ,because i'm about to give up.
thnx in advance!!
when we're in the room i CAN see his game,but when i try to join i get an ERROR not able to join host or something like that.