Sun, it's been really quite disgraceful since the other side of last weekend, but those are different messages than what I get, so I'd recommend you re-boot the machine and get a new internet connection at the same time. (I get to assignment servers ending in 200 and 204 usually before it loops out trying to go from there and get assigned an actual work server with WU's.) That's been pretty much after every finished GPU WU though for a few days now, and unfortunately the word disgraceful is appropriate.
Quitting the program and even needing to eliminate at the Task Manager level (right click the bottom task bar at the bottom of your Windows desktop screen) is usually what I need to do and that usually works but it shouldn't be necessary and we shouldn't have to play wizards or plumbers or whatever this is. Yours is a different error message too, but go ahead and try it if overnight hasn't fixed it.
But yes, it's not just you, they're having major problems for now. :-{