Firewall pinged back at www.grc.com port scan

cellbm

Commendable
Sep 20, 2016
5
0
1,510
0
www.grc.com

I did open port scan, no open ports but the test was failed because they said that my firewall pinged back at them. It hasnt pinged back before, so this made me worried.

Is this a sign of malware?
 
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