Comment 5 for bug 1576740

As Roman pointed above, changing Nova config option helps with this problem. The traceback shows that nova-api couldn't be reached via http (but it could be reached via https). Adding 'secure_proxy_ssl_header = HTTP_X_FORWARDED_PROTO' opt to [DEFAULT] group to nova.conf file solves the issue.

Seems like this problem should be fixed from the Puppet side. Moreover it should be fixed in general for other components too (NOT only for Nova). Maybe there were no similar tests in other components causing to the same problem.