ICP DAS USA M2M-720-A Faq page 15

download the utility at http://nmap.org/download.html
The user can test the communication ports by nmap.exe
<Server IP> (ex: C:\nmap.exe 61.221.131.37). If the
communication port 21, 22, 23, 80, 443(default), 10000,
10001's state are open. It means the server is OK.
NMAP test
M2M-720-A FAQ (Version 1.20, Oct/2012) PAGE：15