For my WHS 2011, I had been tweaking to get the best AV/Firewall combination working. In the end, my last configuration was:
- Comodo Internet Security 2011 Pro (Firewall Off)
It turns out that I am unable to open the Dashboard from a remote workstation. I pinpointed the problem to Threatfire somehow blocking it and there is no configuration to unblock it. So, in the end (for now), Threatfire is kicked out of the WHS and everything is working fine now again.
So, after a extended period of hunting, the best combination I could get working is Comodo Internet Security 2011 Pro without the Firewall enabled. Let me know how you addresses your WHS 2011 AV/FW needs!