Citrix XenApp 6.5: the central store inspection failed (Single Sign-On)

I was training for my Citrix XenApp 6.5 certification. When I was running the “Configure and discovery” wizard in the Citrix XenApp application, I received the error below.

I presume that SSO is already installed. Make sure you login as a Domain Admin on your domain controller. (Very important)

Cancel the wizard and start the XenApp 6.5 CD on your domain controller. Browse to Manually install components -> Server Components -> Additional Features -> Single Sign-On -> Central Store -> Active Directory -> Step 1: Extend Active Directory. After completing the first step, run Step 2: Create Central Store

Close and reopen the Citrix AppCenter on your XenApp server and try the discovery again.

Good luck!