Firefox 15-based TBB: "proxy server refusing connections" to check.tpo
In the recent alpha testing bundles, Runa and I have both confirmed that on Linux and OSX, going to check.torproject.org results in Firefox claiming that the proxy server is refusing connections. We were both able to browse around to other websites. I know there's some magic communication between torbutton and check.tpo so I'm assuming the problem is there.
I've assigned this a priority of blocker because I cannot release the new bundles until it is fixed, but I hope my decision to do so does not cause you to have a heart attack, Mike.