The author discusses different ways to test port connectivity from the command line. They mention that Windows users can rely on PowerShell’s Test-NetConnection cmdlet, which is a nifty tool for testing connections to a port. They also highlight the fact that Windows has included ssh and curl for a few years, so users don’t need to install additional tools like Putty for SSH connectivity. The author explains how to use curl and ssh to test port accessibility and provides examples for each. They also mention other CLI tools available for Linux, Unix, and MacOS users, such as netcat and nmap. The author emphasizes that these built-in tools can be handy for quickly testing ports from the command line, especially for Windows users.
https://www.carehart.org/blog/2023/10/1/testing_port_reachability_with_other_than_telnet