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PortSentry is a program designed to detect and respond to port scans against a target host in real-time. It runs on TCP and UDP sockets and works on most UNIX systems. Advanced stealth detection modes are available under Linux only and detect SYN, FIN, NULL, XMAS, and Oddball packet scans. All modes support real-time blocking and reporting of violations. All modes support real time alerting and blocking.

PortSentry is a program designed to detect and respond to port scans against a target host in real-time. It runs on TCP and UDP sockets and works on most UNIX systems. Advanced stealth detection modes are available under Linux only and detect SYN, FIN, NULL, XMAS, and Oddball packet scans. All modes support real-time blocking and reporting of violations. All modes support real time alerting and blocking.