Hi Now I try to deplay Havana OVS+GRE in centos6.5. let neutron, glance and cinder in single server. # rpm -qa | grep openstack-packstack openstack-packstack-2013.2.1-0.29.dev956.el6.noarch Horizon in control node. 172.18.1.12 is control node IP After finish install , I can not login the Dashboard. 1: login to Neutron node, add iptables rule, let control node can access Neutron -A INPUT -s 172.18.1.12/32 -p tcp -m multiport --dports 9696,67,68 -m comment --comment "001 neutron incoming 172.18.1.12" -j ACCEPT restart httpd and ok ,successful login. 2： after login Dashboard, I found the glance and cinder have same problem. so I have do the same job, ssh to glance node and cinder node , add the iptables rules , restart iptables, the working. -- Shake Chen