I'm not asking for support Jeremy, it's called contributing to a discussion, because these are discussion boards. It's cleaner that way, keeping all similar topics in the one thread rather than me making some random comment in a new thread without any context. Doesn't make any sense.
My suspicions were correct, it was something on the server side. This morning it worked, it was properly asking for a username and password again and logged in fine.
What I was contributing was that this error doesn't seem to have a knowable cause (on our end) nor is it clear what it means, and it didn't seem to matter what I did on the client side, it didn't help.