sudo tail -f /var/log/nova/nova-vncproxy.log
[sudo] password for haji:
(nova): TRACE:   File "/usr/bin/nova-vncproxy", line 116, in <module>
(nova): TRACE:     host=FLAGS.vncproxy_host)
(nova): TRACE:   File "/usr/lib/python2.7/dist-packages/nova/wsgi.py", line 116, in start_tcp
(nova): TRACE:     socket = eventlet.listen((host, port), backlog=backlog)
(nova): TRACE:   File "/usr/lib/python2.7/dist-packages/eventlet/convenience.py", line 38, in listen
(nova): TRACE:     sock.bind(addr)
(nova): TRACE:   File "/usr/lib/python2.7/socket.py", line 224, in meth
(nova): TRACE:     return getattr(self._sock,name)(*args)
(nova): TRACE: error: [Errno 13] Permission denied
(nova): TRACE: