![]() The main purpose of writing this post is to get acquainted with the best free port scanner tools. Firewalls can be configured to detect port scans and block traffic from the address that’s scanning. A port scan can help an attacker find a weak point to attack and break into a computer system. So, if you’re running an FTP server on port 5001 instead of port 21, the port scan would reveal this. You need to make sure that an unqualified person (actually a hacker) can’t scan your network ports because scanning ports can be the beginning of a network attack. Port scans can also help detect services running on non-default ports.
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