sorry, I should've added that up front. yes, it's a map service and I'm consuming the rest endpoint.
I don't have an http utility but will go search one out. How would that explain taking a working service and copying it over and it no longer working under the new URL though? We run dozens of map services on our service and whenever we setup a new one, we pull the flexviewer from a "master" folder that has some common, pre-set modifications. In the past, all we've done is copy the master folder and rename it, make a couple mods pointing to the right endpoint or changing the view or adjusting the identify widget and the process worked fine. Since our upgrade to 10.1, seems like we've had more trouble than help...