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macOS has a much better tool than telnet for testing remote server connectivity | Igor Kromin
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Telnet Command Usage in Linux/Unix | DigitalOcean
How to Check if a Port is Open (with the telnet command) - YouTube
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command line - How to get a Port to listen on Windows 7? - Super User
Penetration Testing on Telnet (Port 23) - Hacking Articles
Troubleshooting Basic Network Connectivity Using A Telnet Client | Richard Hicks' Forefront TMG Blog
