I see this too, on VMWare and Hyper-V guests. A mystery wrapped in an enigma. I found a hint that suggests the guests need to allow SIM to inventory, as in, credentials that SIM uses to talk to each guest in addition to what is provided by the wbem/wmi credential provide with host inventory. Also looking in to a previous post on this thread regarding monitoring vCenter to get the details. This may have some legs as vCenter shows the correct/desired ip4 address while the unreachable addresses are not listed.
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