Thursday 26 February 2004 — This is more than 19 years old. Be careful.
Port Knocking is a clever technique to secure a machine. No ports are open, but failures on ports are monitored for a specific sequence of port attempts. If the correct ports are attempted in the correct sequence, then a port is opened, and the external machine can get in. The technique adds a meta-level to normal security measures, and turns failures into interesting information.
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