The trick seemed to be deleting all discovery ranges and entering them again. The health status is now showing just fine. Not the ideal fix to be honest, but at least now it's working. Thanks for all your feedback. 
Hello. I am using Dell openmanage essentials to manage our servers, ESXi included. However, for our ESXi servers (which are all 5.1.0 build 914609) I am unable to get the health status. The servers appear under the "VMware ESX Servers" folder/umbrella in the devices view and I can see all installed virtual machines, including servicetag and various other bits of HW information.  This is what I have done: - Installed the OMSA VIB through vCenter Update Manager (dell repository) - Verified the installation of OMSA VIB and rebooted host - Configured SNMP traps - Enabled CIM OEM - Discovered the server though WSMAN protocol I've separately set up discovery through WSMAN and "status check" through SNMP.  Through the Troubleshooting Tool that comes along with Dell OpenManage Essentials I am able to successfully contact the server using OMSA Remote Enablement, Port check, SNMP and WSMAN.  I'm therefore stuck. Anyone have any idea what might be wrong? Kind regards, Nils Rune Hjelle
Unknown heath status ESXi 