Thanks every one ,I just figured out the problem .
If you are having a problem with getting these two pairing to work, then DO NOT sit there and remove the appliance and rebuild it 4x like i did. simply edit the hosts file of each VM replication appliance and add the vCenter servers of both sides. To do so
Follow this steps on both the VM Replication Appliance.
vi /etc/hosts
2.
i {insert}
3.
IP_OF_VC_1 {tab} FQDN {tab} hostname
4.
IP_OF_VC_2 {tab} FQDN {tab} hostname
5.
{escape button}
6.
:wq
or
search google for vsphere-replication-cannot-pair-vrms-servers-with-vrm-server-generic-error"
Thanks
Regards
Salman Earn