Quote Originally Posted by To-M
Any chance to test with the DSS LITE infront of the ISA server just to see if can connect.
Yes, I did connect the DSS Lite after the border router infront of the firewall. Activation was now successful. But it would be good to know which ports/protocols we need to open for the registration just in case case we need to reactivate it. Port 10444 is not all. It's much work to change the network physical and logical just for activation ;-)

Thanks,
Marcus