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A device will be unknown if you are only able to monitor it using ICMP alone. SNMP/WMI is required to identify the device. Make sure the discovery profile has all the required community strings and windows credentials and that any access-lists in place are allowing SNMP from these new servers
Thank you Tony, that makes sense, I'm learning as I'm going along here. Really appreciate your response.
I have found a few VMs that were missed by the GPO, so I've added the details into the SNMP Service, done another rediscover & Poll and they have now moved into the VMware category. I still have quite a lot outstanding so I guess I need to just work through them.