VIRTUALIZATION – ESXi hosts do not respond and greyed out in vCenter

1) Veify ESXi host hardware and power state
2) Verify if ESXi host responds to PING from vCenter Server
3) DCUI to ESXi host to verify the Physical console
4) Verify the DNS is configured correctly on ESXi host
5) Connect to the ESXi Host using vSphere Client to check ESXi Host is running.
6) Reboot the ESXi Host
7) Physically login to the console of ESXi Host and validate the settings