On my Mac (10.14.2) i always have to stop the network filter for detection of my Google Chromecast device. By now i haven't found any way to discover the device with the network filter started.
First i have to start Google Chrome. Then i take the choice of "Streaming...". With the network filter stopped, the Chromecast device is always shown. But with the network filter started, it is not shown.
I took a little research and found, that Google Chrome uses multicast with destination port 1900. So i tried this out on the Google Chrome process. Not working. Then i tried it out with "Any process". Still not working.
Does anyone have a idea, what settings are to be taken for successful detection?