OK I'll give it shot

..........Desktop ....................Tuner
Filter: host 192.168.1.50 and host 192.168.1.35

All I see are ping and ARP packets, and responses between my desktop and the tuner
I use Pingman Multiiping to monitor connectivity to key endpoints
When I load the Config GUI, there ...

I have an HDFX-4K runing the latest firmware 20261107

HDHomeRun Setup can find the tuners
HDHomeRun Windows 11 app can find the turner and play
Channels DVR can find the tuner and play and record tuner channels
Channels clients on Google Streamer find and play tuner channels

HDHomeRun GUI Config ...