Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/eventlet/wsgi.py", line 336, in handle_one_response
    result = self.application(self.environ, start_response)
  File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 147, in __call__
    resp = self.call_func(req, *args, **self.kwargs)
  File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 208, in call_func
    return self.func(req, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/vnc/auth.py", line 59, in __call__
    connection_info = self.get_token_info(token)
  File "/usr/lib/python2.7/dist-packages/nova/vnc/auth.py", line 76, in get_token_info
    {"method": "check_token", "args": {'token': token}})
  File "/usr/lib/python2.7/dist-packages/nova/rpc/__init__.py", line 45, in call
    return get_impl().call(context, topic, msg)
  File "/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py", line 739, in call
    rv = list(rv)
  File "/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py", line 705, in __iter__
    self.done()
  File "/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py", line 685, in done
    self._connection.close()
  File "/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py", line 570, in close
    self._done()
  File "/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py", line 547, in _done
    self.connection.reset()
  File "/usr/lib/python2.7/dist-packages/nova/rpc/impl_kombu.py", line 383, in reset
    self.channel = self.connection.channel()
  File "/usr/lib/python2.7/dist-packages/kombu/connection.py", line 99, in channel
    return self.transport.create_channel(self.connection)
  File "/usr/lib/python2.7/dist-packages/kombu/transport/pyamqplib.py", line 197, in create_channel
    return connection.channel()
  File "/usr/lib/python2.7/dist-packages/kombu/transport/pyamqplib.py", line 130, in channel
    return Channel(self, channel_id)
  File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/channel.py", line 82, in __init__
    self._x_open()
  File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/channel.py", line 471, in _x_open
    (20, 11),    # Channel.open_ok
  File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/abstract_channel.py", line 95, in wait
    self.channel_id, allowed_methods)
  File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/connection.py", line 231, in _wait_method
    self.wait()
  File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/abstract_channel.py", line 97, in wait
    return self.dispatch_method(method_sig, args, content)
  File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/abstract_channel.py", line 115, in dispatch_method
    return amqp_method(self, args)
  File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/connection.py", line 380, in _close
    raise AMQPConnectionException(reply_code, reply_text, (class_id, method_id))
AMQPConnectionException: (503, u"COMMAND_INVALID - second 'channel.open' seen", (20, 10), 'Channel.open')