Portqry was particularly popular for Exchange Server diagnostics, checking ports like 25 (SMTP), 443 (Outlook Anywhere), 587 (SMTP submission), and 993 (IMAP SSL).
: To check if a web server is listening on port 80: portqry -n servername -e 80 portqry command
Useful for documenting connectivity tests. checking ports like 25 (SMTP)
Portqry can be downloaded from Microsoft Download Center as "PortQry Command Line Port Scanner" (portqry.exe) or as part of "PortQryUI" (GUI version). 443 (Outlook Anywhere)