TCP Half Open Scan

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What is a TCP Half Open Scan?

A TCP Half Open Scan determines if a port is open by performing the first half of a three-way handshake. It is also referred as the SYN scanning. In SYN scanning, the hostile client or attacker attempts to set up a TCP/IP connection with a server at every possible port. This is done by sending a SYN (synchronization) packet, as if to initiate a three-way handshake, to every port on the server.


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