Hi Kashyap, Its Centos6.5 and control and 3 compute node setup in-house cloud and without LDAP keystone settings(driver=keystone.identity.backends.ldap.Identity) everything working fine. those are, 1.Instance spawn perfectly, 2.live migration work perfectly. then try to configure keystone with LDAP driver gives that error on neutron server.log. 3.This setup up is tested on without ml2 and even ml2 test end with same issue. I will attached the LDAP file and neutron file. *keystone version 0.9.0 below shows the neutron error show on compute.log