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Sophos UTM 9.313-3 Visible to online scans (pcflank and various nmap scans)

I would like to prevent responses to port scans and the like but I keep failing various online stealth scans.

PC Flank: Make sure you're protected on all sides.  
https://pentest-tools.com/discovery-probing/tcp-port-scanner-online-nmap

I have not configured any settings beyond the initial setup. I have no ports open and I do not have it configured to respond to pings.

If I have my router connected to the modem I can pass these tests.

I know I am placing too much importance on being "stealth" but I can't figure out why I can't achieve it. 

Thanks in advance for any advice.


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