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What is Port 23?

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Port 23 is a TCP port traditionally assigned to a telnet daemon. Telnet is a simple protocol used a long time ago for a computer to log into a Unix server or mainframe. You would open a telnet connection to the server, and it would respond with a login prompt. After logging in, you could run programs and make changes to the Unix server. Telnet fell out of common use because it was fairly easy for someone to see your username and password when you sent them.
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