It's a known issue with the new virgin media superhub 2. You have to enabe IPSec pass-through on the Firewall page.
Sure Signal works by establishing an IPSec VPN tunnel you never needed to tick the same box on the original super hub and I upgraded 2 days ago, as soon as I did it went to a solid red light.
Log in to the router (http:\\192.168.0.1) and, go to advanced, then set the firewall on and 'Low', and make sure IPSec ticked.
