Open Stack

Hi,

I've lunched an instance using OpenStack dashboard but cann't start a
VNC session. It displays this error message:

Error: Unable to get vnc console for instance
40c098b8-1c92-4b16-9c33-964ef6c5b950: The server could not comply with
the request since it is either malformed or otherwise incorrect.

Any idea what's wrong and how can be fixed?


Thanks

Joe