OpenStack: Failed to connect to server (code: 1006)

install openstack on three nodes
In OpenStack Dashboard (Horizon), when I launch an Instance and I am trying to connect to the Instance via Dashboard VNC Console – I am getting error: Failed to connect to server (code: 1006). This is most often caused by improper /etc/nova/nova.conf configuration on Compute node, where the Instance is running:

openstack_vnc_failed_to_connect_to_server_code_1006
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