The only actual change I made was to install the dyndns updater -- which should not matter for that type of error. I wonder if you were just unlucky to login when someone else with an incompatible firewall was there?
Is anyone getting a "we have lost our connection" the first time you login, but succeed in logging in and staying in the game a second time? It's happened several turns for me now.
I've gotten that about six times now in 2 different pitbosses, so this will prove to be a slight hassle as the game gets later. Oh well.