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please help me out, I am confused in this.

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Upon closing a port, nmap reports it "closed".

When it reports it "filtered" it means that it is behind a firewall or other security control so nmap cannot resolve the port and reports it filtered. It can be open behind the firewall but from your network, it is behaving as a closed one.

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  • This is not quite right and is missing the important details for how nmap determines whether a port is up or not. Please review the duplicate links above (or read the nmap documentation) to get a sense of the difference between "closed" and "filtered".
    – schroeder
    Aug 10, 2020 at 10:49

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