Here's my recent fail story: - Typed "trychooser" in the location bar. - Got "http://build.mozilla.org/trychooser" listed on top - Selected it. - Got a DNS error. Turns out, http://build.mozilla.org/trychooser has been 301 redirecting to http://trychooser.pub.build.mozilla.org/ for a while, which I wasn't aware of. And http://build.mozilla.org/ was recently turned down. Interestingly, I /think/ (which I can't verify now, since I've now been to http://trychooser.pub.build.mozilla.org/) that http://trychooser.pub.build.mozilla.org/ wasn't even listed when I typed trychooser.

I think this is a duplicate, definitely not the first time I see the request, it's a longstanding issue. FWIW I see both the new and the old addresses in my locationbar when typing trychooser.