Problem: In vSphere Web Client 6.0 the ESXi hosts disappear in the left hand navigation, and display the error message:

“ManagedObjectReference: type = HostSystem, value = host-XX, serverGuid = XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXX refers to a managed object that no longer exists or has never existed.” (where the X characters are unique per installation)



Solution: (at least in our case) Upgrade the NetApp VSC plugin application (on its server) to at least version 6.2 Patch 1 (6-2-0-6.2P1), and update the plugin in vSphere Web Client by pushing it from the plugin server.

The patch is available on: and there is a forum post on that briefly explains the problem and the patch.