Vcenter Appliance add to domain

Hello,

I got a problem with domain authentication.

I can connect the Appliance to the domain (operation succesfull)

Reboot the appliance, everything looks fine.

When i log in to the vcenter server through the vcenter client, i go to permissions.

I cannot add a domain user/group

Only things i see is:

(Server)

White line

SYSTEM-DOMAIN

I do not see my domain name.

So i followed http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2002626 and that was also succesfull.

After a reboot again opened vcenter client, and again, no domain name, only the 3 mentioned above.

Vcenter server Appliance 5.1.0.5100 Build 799730

Please need some advise in this case.

Hope anybody can help.