Just checked and it is up for me. You didn't mention what the server error number is/was. I think 501 or 502, can't remember, I have gotten in the past and if I remember correctly on your browser click on tools, and click on delete history, you don't have to delete all your browsers history just the cache and see if that fixes the issue.
It was the 502 error and definitely on their end. I was in the middle of a help session when everything froze. I got the blank page with the, 502 internal server error, message. It was fixed within a couple of hours though. All is good now. Thanks!