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internet services

Linux / UNIX Find Out What Program / Service is Listening on a Specific TCP Port

Q. How do I find out which service is listening on a specific port? How do I find out what program is listening on a specific TCP Port?
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Sysadmin because even developers need heroes!!!

Restrict SSH Access Using tcpd (TCPWrapper) on Linux or Unix

How do I use tcpd on a Linux to restrict ssh access?
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