# Pastebin Vo9RrSfq
stack@devstackpy27-2:~/devstack$ nova list
No handlers could be found for logger "keystoneauth.identity.generic.base"
ERROR (ConnectFailure): Unable to establish connection to http://172.21.21.140:5000/v3/auth/tokens: HTTPConnectionPool(host='172.21.21.140', port=5000): Max retries exceeded with url: /v3/auth/tokens (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fbaec8d48d0>: Failed to establish a new connection: [Errno 111] Connection refused',))