I have several VMWare ESX hosts in OpManager that are no longer reporting information and when I try to rediscover them I get the error message "Unable to Rediscover Host".  The credentials are valid and I have other VMWare hosts that are reporting information fine.  Can you advise how I can rediscover these hosts without removing and re-adding them?

In addition there are also a number of orphaned VMs that remain so even when rediscovered.  Some of the orphaned ones are also still reporting information.  Can you advise how I can resolve the orphan status without removing and re-adding them.

Thanks