Sometimes you might need to execute telnet from Docker container, but telnet typically isn’t installed and can’t be installed easily.
However there’s a simple solution which I want to share with you.
But you can easily test port availability with Python:
import socket conn=socket.create_connection(('kagarlickij.com','80'))
I hope this info will be useful to you, and if you need any help feel free to use contact from on the main page.