Reconnaissance filters protect your system against malicious traffic that scans
your network for vulnerabilities. These filters constantly monitor incoming traffic,
looking for
any sign of network reconnaissance. These attacks probe your system, seeking any weakness
that
can be exploited by attacks. In effect, the attacks attempt to perform reconnaissance
of your
network to report its strengths and weaknesses for further attacks.
By default, Reconnaissance filters are either disabled or set to Block/Notify.