thank you and here is the scenario.
1. Host(y) ESXi5.5 where VCSA6.5 installed and managed through vCenter5.5.
2. The Host(y) ESXi5.5 was in Cluster A under vCenter5.5.
3. Moved Host(y) ESXi5.5 + VCSA6.5 to new Cluster B setup in VCSA65 setup
4. Rebooted Host(y) ESXi5.5
5. Noticed that the VCSA65 appliance is inaccessible as shown through the VCSA65 portal
6. Also noticed that VCSA6.5 appliance moved to host(z) + ESXi5.5 and is accessible through vCenter5.5 in Cluster A