Trouble getting to https://civicrm.org/go/demo?

If I click on the Demo menu item on civicrm.org or forum.civicrm.org when I am on Firefox, I (eventually) get sent to https://civicrm.org/go/demo but at the top of the page is the message:

"Oops, looks like this request tried to create an infinite loop. We do not allow such things here. We are a professional website!"

If I do the same thing when I am on Chrome the demo page doesn't load, instead I get:
"This web page has a redirect loop." which expands to
"The web page at https://civicrm.org/go/demo has resulted in too many redirects. Clearing your cookies for this site or allowing third-party cookies may fix the problem. If not, it is possibly a server configuration issue and not a problem with your computer."

If I try it on IE 11, I get "This page can’t be displayed".

I discovered this whilst checking the links in the user and admin book. I am loath to put this link in the book if it won;t work for many people. Is it my problem or a civicrm problem?