Hi,
I am not totally sure, but it seems I had the similar issue when using Netspot2.4. After I updated iperf3 to the latest version. The problem has gone.
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In our before TCP test, Netspot always hangs for scanning in all my tests. If I wait long time enough, iperf3 on the server side will receive: iperf3: error – unable to receive results.
Hope this can provide some information.