With the recently released VMware vSphere 5.5, the component Single-Sign-On (SSO) has been completely rewritten. The biggest change is that the RSA database has been removed, which eliminates much of its complexity. There is also a new identity type (Active Directory (Integrated Windows Authentication)) that works without specifying the AD Controllers directly, like the old vSphere 4.x / 5.0 authentication. The whole process is much easier. This post shows how to enable Active Directory Authentication within the new vSphere 5.5 Single-Sign-On. If you are using vSphere 5.1, read this post.

The method shown in this post allows you to manage users and groups in your central directory. This works for both, the vCenter Server 5.5 installed on Windows Server and the vCenter Server Appliance (VCSA).

--> Please see the rest on the blog : http://www.virten.net/2013/09/howto-ad-authentication-in-vcenter-sso-5-5/