What Is Port Knocking?
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Port knocking is a security mechanism that involves sending a specific sequence of connection requests to a specific set of ports on a host in order to gain access. The sequence of requests must be done in the correct order and is usually done through a specialized port knocking client. The server maintains a list of connection requests that it has received and, if the correct sequence is received, will open the requested port to allow the connection from the client. This technique can be used to hide services from the general public until the correct port knocking sequence is received.