Comment 2 for bug 771512

My current working hypothesis is that something in Nova is blocking. This causes the connect_timeout to trigger (because once eventlet context switches back into the main greenthread (or whatever it is that it does)), the timeout has expired without being cancelled. This would explain the log message in rabbit saying that the connection was abruptly terminated (meaning the connection was actually established, in spite of Nova saying it timed out).

If that's indeed the case, yes, we shouldn't be blocking, but eventlet also should check if the connection has been established before it kills the connection attempt.