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Keep AIO install as it is. No changes.
Run on remote host :-

# ssh -L 5900:127.0.0.1:5900 -N -f -l root 192.168.28.178
# ssh -L 5901:127.0.0.1:5901 -N -f -l root 192.168.28.178
# ssh -L 5902:127.0.0.1:5902 -N -f -l root 192.168.28.178
# ssh -L 5903:127.0.0.1:5903 -N -f -l root 192.168.28.178
# ssh -L 5904:127.0.0.1:5904 -N -f -l root 192.168.28.178

Just issue on remote host

$ vncviewer localhost:590(X)
0 for first instance started
1 for second and etc.
See what happens ?

Keep AIO install as it is. No changes.
Run on remote host :-

# ssh -L 5900:127.0.0.1:5900 -N -f -l root 192.168.28.178
# ssh -L 5901:127.0.0.1:5901 -N -f -l root 192.168.28.178
# ssh -L 5902:127.0.0.1:5902 -N -f -l root 192.168.28.178
# ssh -L 5903:127.0.0.1:5903 -N -f -l root 192.168.28.178
# ssh -L 5904:127.0.0.1:5904 -N -f -l root 192.168.28.178

Just issue on remote host

$ vncviewer localhost:590(X)
0 for first instance started
1 for second and etc.
See what happens ?
Launch browser to http://192.168.28.178/dashboard

Keep AIO install as it is. No changes.
Run on remote host :-

# ssh -L 5900:127.0.0.1:5900 -N -f -l root 192.168.28.178
# ssh -L 5901:127.0.0.1:5901 -N -f -l root 192.168.28.178
# ssh -L 5902:127.0.0.1:5902 -N -f -l root 192.168.28.178
# ssh -L 5903:127.0.0.1:5903 -N -f -l root 192.168.28.178
# ssh -L 5904:127.0.0.1:5904 -N -f -l root 192.168.28.178

Just issue on remote host

$ vncviewer localhost:590(X)
0 for first instance started
1 for second and etc.
See what happens ?
Launch 
You should be able to launch browser to http://192.168.28.178/dashboard
http://192.168.28.178/dashboard without port mapping.
I would expect you to be prompted for login ,  without port mapping.
Just use ipv4 iptables firewall with port 6080 open, e.g. /etc/sysconfig/iptables should have entry
    -A INPUT -p tcp -m multiport --dports 6080 -m comment --comment "001 novncproxy incoming" -j ACCEPT 
In case of failure - just one mapping
# ssh -L 6080:127.0.0.1:6080 -N -f -l root 192.168.28.178

Keep AIO install as it is. No changes.
Run on remote host :-

# ssh -L 5900:127.0.0.1:5900 -N -f -l root 192.168.28.178
# ssh -L 5901:127.0.0.1:5901 -N -f -l root 192.168.28.178
# ssh -L 5902:127.0.0.1:5902 -N -f -l root 192.168.28.178
# ssh -L 5903:127.0.0.1:5903 -N -f -l root 192.168.28.178
# ssh -L 5904:127.0.0.1:5904 -N -f -l root 192.168.28.178

Just issue on remote host

 $ vncviewer localhost:590(X)
 0 for first instance started
 1 for second and etc.
 See what happens ?

You should be able to launch browser to http://192.168.28.178/dashboard without port mapping.
 I would expect you to be prompted for login ,  without port mapping.
 Just use ipv4 iptables firewall with port 6080 open, e.g. /etc/sysconfig/iptables should have entry
  -A INPUT -p tcp -m multiport --dports 6080 -m comment --comment "001 novncproxy incoming" -j ACCEPT 
# service iptables restart (after adding this raw)
In case of failure - just one mapping
# ssh -L 6080:127.0.0.1:6080 -N -f -l root 192.168.28.178

Keep AIO install as it is. No changes.
Run on remote host :-

# ssh -L 5900:127.0.0.1:5900 -N -f -l root 192.168.28.178
# ssh -L 5901:127.0.0.1:5901 -N -f -l root 192.168.28.178
# ssh -L 5902:127.0.0.1:5902 -N -f -l root 192.168.28.178
# ssh -L 5903:127.0.0.1:5903 -N -f -l root 192.168.28.178
# ssh -L 5904:127.0.0.1:5904 -N -f -l root 192.168.28.178

Just issue on remote host

    $ vncviewer localhost:590(X)
    0 for first instance started
    1 for second and etc.
    See what happens ?

You should be able to launch browser to http://192.168.28.178/dashboard without port mapping.
 I would expect you to be prompted for login ,  without port mapping.
 Just use ipv4 iptables firewall with port 6080 open, e.g. /etc/sysconfig/iptables should have entry
 -A INPUT -p tcp -m multiport --dports 6080 -m comment --comment "001 novncproxy incoming" -j ACCEPT 
# service iptables restart (after adding this raw)
In case of failure - just one mapping
# ssh -L 6080:127.0.0.1:6080 -N -f -l root 192.168.28.178

Also set ALLOWED_HOSTS = ['*'] in /etc/openstack-dashboard/local_settings and restart httpd