Here are a few suggestions on how to troubleshoot VNC issues.

Check if VNC is running:

 [root@icehouse1 ~(keystone_admin)]# systemctl | grep VNC
    openstack-nova-consoleauth.service                                                               loaded active running   OpenStack Nova VNC console auth Server
    openstack-nova-novncproxy.service                                                                loaded active running   OpenStack Nova NoVNC Proxy Server

Check if there are firewall rules preventing connections:

    [[root@icehouse1 ~(keystone_admin)]# iptables-save | grep vnc
    -A INPUT -p tcp -m multiport --dports 6080 -m comment --comment "001 novncproxy incoming" -j ACCEPT

Is the VNC port open and the daemon listening?

[root@icehouse1 ~(keystone_admin)]# netstat -anpt | grep 6080
tcp        0      0 0.0.0.0:6080            0.0.0.0:*               LISTEN      2376/python
tcp        0      0 192.168.1.127:48457     192.168.1.127:6080      ESTABLISHED 8856/chrome
tcp        0      0 192.168.1.127:6080      192.168.1.127:48457     ESTABLISHED 9267/python
[root@icehouse1 ~(keystone_admin)]# ps -ef | grep 9267
nova      9267  2376  0 08:06 ?        00:01:08 /usr/bin/python /usr/bin/nova-novncproxy --web /usr/share/novnc/

Start here, edit your question to add more details as you go.

Most probably this is an answer. View https://ask.openstack.org/en/question...

   service httpd status -l
    Redirecting to /bin/systemctl status  -l httpd.service
    httpd.service - The Apache HTTP Server
       Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled)
       Active: failed (Result: exit-code) since Tue 2014-07-15 16:31:44 MSK; 2min 41s ago
      Process: 2658 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=0/SUCCESS)
      Process: 1563 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
     Main PID: 1563 (code=exited, status=1/FAILURE)
       CGroup: /system.slice/httpd.service

    Jul 15 16:31:44 icehouse1.localdomain httpd[1563]: AH00548: NameVirtualHost has no effect and will be removed in the next release /etc/httpd/conf/ports.conf:7
    Jul 15 16:31:44 icehouse1.localdomain httpd[1563]: AH00526: Syntax error on line 1 of /etc/httpd/conf.d/openstack-dashboard.conf:
    Jul 15 16:31:44 icehouse1.localdomain httpd[1563]: Name duplicates previous WSGI daemon definition.
    Jul 15 16:31:44 icehouse1.localdomain systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
    Jul 15 16:31:44 icehouse1.localdomain systemd[1]: Failed to start The Apache HTTP Server.
    Jul 15 16:31:44 icehouse1.localdomain systemd[1]: Unit httpd.service entered failed state.