TCP SYN (Half-Open)
A SYN scan aims to be more stealthy by initiating a handshake with aSYN packet. However, should a SYN/ACK be received, the sender
responds with a RST packet, destroying the connection. As a full
connection is never established, some security devices will not log the
scan, current commercial devices will recognize this as a port scan and
comment accordingly.
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