An administrator is able to manage an ESXi 6.x host connected to vCenter Server using the vSphere Web
Client but is unable to connect to the host directly.
Which action should the administrator take to correct this behavior?

A.
Restart management agents on the ESXi host.

B.
Disable Lockdown Mode on the ESXi host through vCenter Server.

C.
Disable the ESXi firewall with the command esxcli network firewall unload.

D.
Reboot the ESXi host.

Explanation:

Disable lockdown mode through the DCUI and then enable it through the vCenter Server instead. The vCenter
Server does not keep track of lockdown mode state changes that initiated outside of the vCenter Server itself.
Reference: http://kb.vmware.com/selfservice/microsites/search.do?
language=en_US&cmd=displayKC&externalId=2040768