Immediately after installing ESXi, an administrator observes that the Configure Lockdown Mode
option is grayed out in the Direct Console User Interface (DCUI).
What is the most likely explanation?
A.
The host has not yet been added to a vCenter Server.
B.
The BIOS on the host does not have NX/XD enabled.
C.
The ESXi host is running in evaluation mode.
D.
The host requires a reboot before this feature is available.
Explanation:
A is correct
Configure Lockdown Mode will be grayed out if vCenter is down or the host is not added/disconnected from vCenter.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1008077
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2040768