Hi all After installation step by step on CentOS7 1503 by Installation Guide - http://docs.openstack.org/liberty/install-guide-rdo/ with the following chapter - Add the Identity service <http://docs.openstack.org/liberty/install-guide-rdo/keystone.html> - Add the Image service <http://docs.openstack.org/liberty/install-guide-rdo/glance.html> - Add the Compute service <http://docs.openstack.org/liberty/install-guide-rdo/nova.html> - Add the Networking service <http://docs.openstack.org/liberty/install-guide-rdo/neutron.html> - Add the dashboard <http://docs.openstack.org/liberty/install-guide-rdo/horizon.html> When login dashaboard,it shows that "Error: Unable to retrieve floating IP addresses and Unable to connect to Neutron." and then , I try more than once can not launch instance on dashboard with the error "Danger: There was an error submitting the form.Please try again." Any one can help me! Thanks a lot. Engine -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack/attachments/20151129/7e79741f/attachment.html>