Run a Discovery request by specifying an IP range and selecting specific platform types. The request does not discover an object(s) if ALL the following conditions are true.
Default port option is selected in the Discover request.
Additional port to search on is also specified.
Both the default and additional ports are occupied on the host(s) being searched.
Workaround: Create separate Discover requests for Default port and additional port, if you want check both default port and an additional port on the objects being discovered.