Keep your ports open - for yourself.

Port knocking: a stealthy system for network authentication across closed ports

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Port Knocking Web Article in Linux Journal

Port Knocking - Network Authentication Across Closed Ports Article in SysAdmin Magazine

The port knocking Perl prototype is licensed under the GPL license. GPL License

Port Knocking (c) 2002-2024 Martin Krzywinski

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Port Knocking (c) 2002-2024 Martin Krzywinski