IPFW unsolicited packets

Hi!

Again me with question about IPFW firewall.
I did check web site Gibson Research and my settings passed but on the test second time it Failed with "unsolicited packets".
I search Internet but I didn't find anything. And my question is also: Do I need to care about unsolicited packets because I am running single FreeBSD 12.0-Release computer, please?

Thank you.
 
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