In /etc/nova/nova.conf:
novncproxy_base_url=http://10.10.1.20:6080/vnc_auto.html
vncserver_listen=10.10.1.20
vncserver_proxyclient_address=10.10.1.20

URL Accessing:
http://10.10.1.20:6080/vnc_auto.html?token=ee544b13-39d3-4664-9364-179bb5e6693d


2013-03-08 08:32:31 AUDIT nova.consoleauth.manager [req-d4f697be-2d3a-4c1f-bc2f-cdc846324bb0 None None] Checking Token: ee559b1a-39d3-4b64-9364-179bb2efe93d, True)
2013-03-08 08:32:31 ERROR nova.rpc.amqp [req-d4f697be-2d3a-4c1f-bc2f-cdc846324bb0 None None] Exception during message handling
2013-03-08 08:32:31 TRACE nova.rpc.amqp Traceback (most recent call last):
2013-03-08 08:32:31 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/rpc/amqp.py", line 253, in _process_data
2013-03-08 08:32:31 TRACE nova.rpc.amqp     rval = node_func(context=ctxt, **node_args)
2013-03-08 08:32:31 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/consoleauth/manager.py", line 102, in check_token
2013-03-08 08:32:31 TRACE nova.rpc.amqp     if token_valid and self._validate_console(token):
2013-03-08 08:32:31 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/consoleauth/manager.py", line 91, in _validate_console
2013-03-08 08:32:31 TRACE nova.rpc.amqp     console_valid = self.compute_api.validate_vnc_console(context,
2013-03-08 08:32:31 TRACE nova.rpc.amqp NameError: global name 'context' is not defined
2013-03-08 08:32:31 TRACE nova.rpc.amqp
2013-03-08 08:32:31 ERROR nova.rpc.amqp [req-d4f697be-2d3a-4c1f-bc2f-cdc846324bb0 None None] Returning exception global name 'context' is not defined to caller
2013-03-08 08:32:31 ERROR nova.rpc.amqp [req-d4f697be-2d3a-4c1f-bc2f-cdc846324bb0 None None] ['Traceback (most recent call last):\n', '  File "/usr/lib/python2.7/dist-packages/nova/rpc/amqp.py", line 253, in _process_data\n    rval = node_func(context=ctxt, **node_args)\n', '  File "/usr/lib/python2.7/dist-packages/nova/consoleauth/manager.py", line 102, in check_token\n    if token_valid and self._validate_console(token):\n', '  File "/usr/lib/python2.7/dist-packages/nova/consoleauth/manager.py", line 91, in _validate_console\n    console_valid = self.compute_api.validate_vnc_console(context,\n', "NameError: global name 'context' is not defined\n"]