Alarms showing in nas but not in USM

Document ID : KB000047928
Last Modified Date : 14/02/2018
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Hosts will not display in USM unless they match at least one group's filter criteria, so the best way to see all alarms in USM is to create a group with a filter of:

not ip address is null

Since all discovered devices will have an IP, this will pull every device into USM, showing all alarms.