KNM5.0 Adding Performance Monitor / CIM Monitor - ReScan Services returns nothing for ESXi 5

I notice that the LUA Script WBEM_ESXi_Health_.lua uses CIM to check ESXi health.

This is working fine and I get "Test OK"

Yet when I try to add a Performance Monitor / CIM Monitor and "ReScan Services" under CIM Monitor Properties / Class it attempts and falls away after a minute.

The ESXi host is answering requests on port 5989

Is there some Windows based CIM tool that I can test whether it is KNM or the ESXi host?

Is there some timeout setting that I can change in the KNM to give it more rescan time?

Thanks