Calin's Humble Scanner - User Guide

Scan method SYN

... or half TCP connect.

Sends a SYN packet to host on a specified port. If the port is open and reacheable from the scanning host, the target host will respond with an SYN+ACK packet. To fully establish the connection CHScanner should send an ACK packet but this method is also known as half TCP connect so a full connection will not be established.
CHScanner will send a RST to close the connection (otherway you can get a very nice DoS).

[ User Guide | Scan Methods ]