Why Nodes not able to join cluster ?

Issue

Getting errors like below, while trying to start the cluster.

Nov 31 11:32:23 corosync [SERV ] Unloading all Corosync service engines.
Nov 31 11:32:23 corosync [SERV ] Service engine unloaded: corosync extended virtual synchrony service
Nov 31 11:32:23 corosync [SERV ] Service engine unloaded: corosync configuration service
Nov 31 11:32:23 corosync [SERV ] Service engine unloaded: corosync cluster closed process group service v1.01
Nov 31 11:32:23 corosync [SERV ] Service engine unloaded: corosync cluster config database access v1.01
Nov 31 11:32:23 corosync [SERV ] Service engine unloaded: corosync profile loading service
Nov 31 11:32:23 corosync [SERV ] Service engine unloaded: openais checkpoint service B.01.01
Nov 31 11:32:23 corosync [SERV ] Service engine unloaded: corosync CMAN membership service 2.90
Nov 31 11:32:23 corosync [SERV ] Service engine unloaded: corosync cluster quorum service v0.1
Nov 31 11:32:23 corosync [MAIN ] Corosync Cluster Engine exiting with status 0 at main.c:2055.