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A critique of port knocking
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Suppose you want to be able to retrieve files from your Linux system remotely. The "standard" method of running the SSH server on port 22 is notoriously inadequate. OpenSSH, which is the SSH server on the majority of Linux installations, suffers from regular exploits of buffer overflow and other vulnerabilities, and you neither have the time to keep up with the patches nor want to make the effort -- you'd rather put up with not being able to access your files. This is where port knocking might seem to help -- but don't count on it.
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