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Its straightforward you’ve got the option to performtelnetbut how about when B doesnt have any service running?
Thats where you need the port listener to help in this situation.
This utility is available for free for Windows 95 to Windows 10.
So here I have port 5500 listened successfully.
Doing this in Linux is slightly more comfortable, isnt it?
To create a port listener using Python
The above two examples are limited to OS.
How about having a python script that can work on Windows or UNIX?
Well, I found thebelowpython code which works on Windows and Linux both.
Check out thisonline course.
I hope the above procedure helps you to create a port listener for the connectivity tests.