Repeated "site temporarily unavaiable" messages while visiting the forums

Ever since the forums seem to be migrated to a newer version of Jive, I often keep seeing error pages for any content that I visit. I've attached the error page for reference. In this specific case, I got that error page while visiting https://developer.jboss.org/message/921728#921728

Refreshing the original URL, which triggered that error page, a few times solves the problem, but this is really annoying.