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One problem with port scanning is that it is easily logged by those services listening at the ports. They see an incoming connection, but no data, so they log an error. There exist a number of stealth scan techniques to avoid this. One is the half-open scan that only partially opens a connection, but stops halfway through. This is also known as a SYN scan because it only sends the SYN packet. This stops the service from ever being notified of the incoming connection. |
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