After installed vCenter server6, you might want to authenticate vCenter sign on with Active Directory user accounts. To do,
you need to configure single sign-on in VMware vCenter 6, you need to add user accounts/groups in vCenter6.
How to add AD Authentication in vCenter 6
1.Open vSphere web client and login with [email protected] user account
2.Click Administration on the navigation pane. Expand Single-Sign on and click Configuration. Select Identity sources tab.