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In order to access the NoVNC console, you need the following ports open on the server:

  • Ports 80 and/or 443, for accessing the Horizon GUI itself.
  • Port 6080, for accessing the console URL

You also need to permit the system running the novnc proxy to have access to VNC ports on the compute nodes, which means the compute nodes need to permit access to ports 5900 through (5900 + the maximum number of active instances you expect to have).

You will need to make sure that novncproxy_base_url is set correctly on your compute nodes.

On the "Console" tab of the "Instance details" screen, look at the URL for the "Click here to show only console" link; make sure the ip address here looks sane.