i defined Active directory Authentication, and also is defined in the Security Profile
I cannot select Users/Groups from the Domain to grant to them permissions
See the Attached
Is it possible that you have the AD authentication Ports blocked somewhere?
What happenes if you leave domain, then rejoin it, reboot the host?
What version of Vcenter you are using? if 5.1 or 5.5 did you install and configure SSO ?
No, is just a New Vmware ESXI 5.5 this one does not have Vcenter,
But i installed another one exactly the same and works
What SSO does to this specific Authentication
If you are not running vCenter you are probably not running SSO either as they go hand in hand.