It doesn't work for me either. It could be a vBulletin problem, as it shows a page that announces you're subscribing to a thread, not a forum.
However, JodoHost normally emails resellers about significant problems and scheduled maintenance other than perhaps a short reboot of a single webserver.
Still, if you want to be aware of any announcements, I suppose you could use a general website monitoring utility, that reports specific changes to a certain website.