Dear friends Its my bigest Problem.I have an isa server Which installed in integrated mode.As externel interface i use my modem.Also i have an internal Network Whith a range of private IPs(192.168.0.1-254).As the first problem my SNAT Clinets culdnot connect to yahoo messenger.For solving this problem i defined a protocol whith this settings: TCP port 5050 and outband direction and i used from this protocol definition in my protocol rule after doing this solved my problem and i can connent to yahoo massenger but yet i have another big problem.SNAT clients yet cannot use from Voice and Webcam whith yahoo messenger.For solving this problem i defined these protocols 1- Tcp port 5001 whith outband direction 2- Udp Port 5055 whith Send&Recieve direction but when SNAT clients try to use this protocol they will have computer crash.What i must do?