notice how he says he only gets it with firefox but MPGH works on IE.
I get random 408s and 503s and they get fixed by the time i switch browsers. But if I just wait 30 seconds or so it still works in the "old" browser. Chances are he wouldn't get that error in Firefox at the time he used IE. Next time he should run both browsers side by side. As you can clearly see from the SS, it's a server error document and it's not a 404 or something that can come up without a server response.