The servers which allow connection on port 80 are not rejecting yet, but they are very loaded (they usually used if you access through a network Firewall).
It's often happening during week-ends when the Stanford university staff is not at work to reset the servers and more computers are running.
Server 107 has disappeared since Friday, I guess they are working on it... server 107 thread
Currently the only servers giving WU are:
.109 (FaH + port80 - heavy loaded)
.117 (Adv - a bit loaded)
.119 (FaH + port80 - really heavily loaded)
Best solutions are to either give your computer a rest, or try again.
10min later... Well it changes every 10min., server .117 is now heavily loaded... have a look yourself if you want the latest updates