How to check if port is open on a remote server with batch file and without third party software? [closed]

Question

As this question is closed (where I intended to answer first) I'm opening this one.

On some machines it is forbidden to install/download binaries so I want to know how can I check if a port on a remote machine is open using only native windows script capabilities.

Answer 1

If you only want to check TCP ports you can use Test-NetConnection. If offers a -Port parameter to define the TCP port.