ok guys...
I guess some of you allready experienced the problem...
when you wanna play SC/BW games with more than one user behind the same router.. it won't work....
here is the solution...
for each gaming PC behind the router do this:
use regedit to edit/create:
HKLM\Software\Battle.net\Configuration REG_DWORD "Game Data Port"
(choose a unique so far unused port for each client)
and then on your router forward each of those ports to the correct client computer... (UDP, not sure if TCP needed)
there ya go.... problem solved