DSC on Vmware ESXi 5.1

I am trying to establish DSC/Sync-failover on LTM-Trial VE 11.3.0.39 but they remain in state Disconnected. /var/log/ltm says "Connection to CMI Peer has been removed" and "Attempting to connect to CMI peer". I can verify that both the LTMs can ping each other on Internal, External, HA and Mgmt IP addresses. Have configured Static Self-IPs across the Internal, External and HA. Have also configured Floating Self-IP on Internal. Have tried the DSC procedure many times deleting peer device. Not sure what is causing this problem.