Can't connect to Chromecast or any other option to cast

Support
1

Issue description:

Hey, I’m trying to stream my music from my navidrome (subsonic) on my TrueNAS to my Pioneer VSX-S520D Receiver. But I can’t get a connection to it from Symfonium App 1.35.
I can play the music localy on my Pixel 5 with GrapheneOS, but not on any Chromecast or UPnP-Device.
I have a Google Chromecast mit Google TV HD, a build in Chromecast Audio in the Pioneer and some UPnP Devices.
When I choose the Chromecast it turns red in the app and the casting-icon gets a !
I already tried to proxy.
Is there something else I can trie?
Have a nice weekend
Thorsten

Logs:

Upload description: debug-20251114_223851.zip

Additional information:

 

 

Reproduction steps:

 
Start Symfonium
Select Chromecast to cast
 

Media provider:

Subsonic

Screenshots:

 

Screenshot 1
Screenshot 11080×2340 329 KB
    

2

What is shown on the TV ?

There’s no upnp attempt in the logs.

3

On TV I see the song I started to play, but it’s not starting to play the song.

PXL_20251116_173720259.MP (Klein)
PXL_20251116_173720259.MP (Klein)853×480 77.9 KB

in Symphonium the Play-Button has the cycling circle around it.

4

I just uploaded a new log-file where I also tried to use a UPNP-Device.

5 
2025-11-16 18:40:44.136 Error UPnPRenderer  Error SetAVTransportURI: error response: {faultcode=s:Client, faultstring=UPnPError, UPnPError/errorCode=716, UPnPError/errorDescription=Resource not found}

The upnp device can’t reach the server, you need to fix the dns or the network configuration or enable the proxy option in the renderer setting in Symfonium.

It’s probably the same issue for Chromecast, but I don’t understand why the session would disconnect without being disconnected on the TV that’s very strange, maybe you are using some special non official GMS ?

6

I’m running Headscale/Tailscale. Enableing the proxy otion made it work with UPNP and Chromecast.
Thanks for the help.