Network services using the TCP Transmission Control Protocol and UDP User Datagram Protocol Internet protocols can be accessed via special ports and this port assignment is generally known, for example the SMTP Simple Mail Transfer Protocol service is assigned to the TCP port 25. If this information is available, attackers might take advantage of the security deficiencies of these services. Portscans are used by hackers to probe secured systems for available services: In order to intrude into a system or to start a DoS Denial of Service attack, attackers need information on network services. The Network Protection > Intrusion Prevention > Anti-Portscan tab lets you configure general portscan detection options.
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