Comment 7 for bug 1606887

According to Nailgun logs there were no attempt to GET /api/version after the revert. However, subsequent attempt to generate diagnostic snapshot succeeded.
I suspect that the revert hasn't been completed and this was the reason GET failed. Just to check the conjecture I recommend add the code which attempt to reconnect at least once and see what happens. Another, and probably better option is to run tcpdump just before the attempt to understand what exactly have happened on the network level.