Jan 14, 2020
What Is UPnP Port Forwarding and How Can I Enable it May 22, 2020 Having trouble with port forwarding.. Solved - Windows 10 Apr 10, 2018 Tutorial: Configure port forwarding - Azure portal - Azure
Port Issue - "tcp Test Failed" Even After Port Forwarding
UDP Port Scanner, Online UDP Port Scan, UDP Port Scanning
If you really want to see if the UDP packets reach your server (for testing port-forwarding) you should use Wireshark and see if UDP packets for the expected ports are seen. If you don't see such packets it's a problem of your router or internet connection - otherwise it is a local problem of your PC (e.g. firewall).
UDP Port Scanner, Online UDP Port Scan, UDP Port Scanning