Want to see if something on your own machine is bound to UDP but not responding?
portqry.exe -n 192.168.1.10 -p udp -r 500:510 portqry udp
This confirms that the network path is clear (no firewall blocking the path to the host), but the service is not running on the target. Want to see if something on your own
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 portqry udp