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Is your single server have a public IP?

I think you have a public IP already.

Did you try connect http://<public_ip>/horizon ?

and checked /etc/nova/nova.conf

novncproxy_base_url = http://<single server="" public="" ip="">:6080/vnc_auto.html

If your network configuration is OK...

you can try add port forwarding.

ex)

iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 80 -j DNAT --to-destination <ip>:80

iptables -A FORWARD -p tcp -d <ip> --dport 80 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

(eth0 and IP is yours)