vCenter reports a connectivity problem with a ESXi 5.x host that is not a member of a
cluster. An administrator attempts to connect directly to the host using the vSphere Client
but fails with the message “An unknown connection error occurred.” Virtual machines
running on the host appear to be running and report no problem. What two methods would
likely resolve the issue without affecting the virtual machines? (Choose two.)
A.
Enter the service mgmt-vmware restart command from either SSH or local CLI
B.
Select Restart Management Agents in the Direct Console User Interface (DCUI)
C.
Select Reboot Host in the Direct Console User Interface (DCUI)
D.
Enter the services.sh restart command from either SSH or the local CLI
A is valid on vSphere Esx 4 Linux Kernel based (mind not the ESX4i)
B is commonly known
C Reboot is really too much of it
D is valid on ESXi hosts
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003490