Cause: The cmd ping command under windows cannot ping a certain port.
Countermeasure: Use tcping tool, Windows does not have this small tool, you need to download it yourself and put it under C:\Windows\System32.
tcping tool download address | https://elifulkerson.com/projects/tcping.php |
Then put tcping.exe under C:\Windows\System32.
Use tcping ip/domain name port