Fingers crossed, etc.
I just got word from IT that they’ve updated the Mono runtime being used on the Mozilla Developer Center to version 2.4. This update was recommended by MindTouch; they believe that the outages we’ve had lately have been caused by a particular bug in the previous version of Mono that we were using.
In particular, apparently the version of Mono that was previously installed was leaking thread handles, resulting in it eventually not being able to spawn new tasks, and therefore ceasing to respond.
So my fingers are crossed, and I’m hoping it works!