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can not access vm via vnc(grizzly)

To: openstack@xxxxxxxxxxxxxxxxxxx
From: sam lee <lixq2000@xxxxxxxxx>
Date: Mon, 29 Jul 2013 11:06:58 +0800

Hi all,

        I am installing openstack grizzly on redhat 6.4. when I created a
instances successfully and tried to access it via vnc, it had no response.
the log file xvpvncproxy.log shows an error as below:

Host: 172.16.2.91:6081

Referer:
http://172.16.2.91/dashboard/project/instances/e1f21ec1-7dfd-452b-ab3e-88ecfabc0929/

User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.31 (KHTML, like
Gecko) Chrome/26.0.1410.64 Safari/537.31

2013-07-29 10:35:18.231 3111 INFO nova.XCP VNC Proxy.wsgi.server [-]
Traceback (most recent call last):

  File "/usr/lib/python2.6/site-packages/eventlet/wsgi.py", line 393, in
handle_one_response

    for data in result:

TypeError: 'NoneType' object is not iterable


Anyone has encountered the same question before? thanks in andvance.