REALLY Solved now, via upgrade to NIS 22: Endlessly-Repeating Entries in Firewall History

Something I like about NIS 22 (in addition to the fact that the tray icon becomes “transparent” to indicate Quiet Mode is on) :

As you can see from what I marked as the "solution" in the thread below, it wasn’t *really* a solution, but instead more of an acknowledgement.  But I am glad to see that with the NIS upgrade to version 22, my history is no longer overrun by a continually-repeating pair of Smart Firewall entries caused by one of my legitimate background programs.  Those entries no longer appear, period.

https://community.norton.com/en/forums/nis-history-has-started-showing-two-odd-entries-virtually-nonstop