Portqry Udp Extra Quality -

portqry.exe -n 192.168.1.10 -p udp -e 53

Example: Querying a port with no service bound to it. UDP port 137 is NOT LISTENING portqry udp

(NTP port) — if no NTP server, you’ll get NOT LISTENING via ICMP. portqry

When using PortQry UDP, the utility sends a UDP probe packet to the target computer on the specified port. The response (or lack thereof) determines the status of the port. Here's how it works: portqry udp

The port is open but the application doesn't respond to the specific packet sent. A firewall is silently dropping the packet. Advanced Troubleshooting Features