This is a known issue with vCenter Server Appliance 6.x.
Currently, there is no solution.
Workaround:
To workaround this issue,
- Add "ADServer-IP" "ADserver-fqdn" "ADserver-SPN" into /etc/hosts file to resolve to correct AD address.
Example: 10.114.13.8 cpt-win.ad.cptroot.com cpt-win