Hi @Kevin_O_Connell,
Sequoia introduced more granular stateful network control by the MacOS. This at times restricts RAATServer from connecting to the coreaudiod via the loopback interface. Our developers are aware of the issue and have a ticket in the pipeline. You can track updates in this thread: Roon on MacOS 15.0+ Sequoia: Audio Zones Disappear, Requiring Local Network Access Reset/Restart [Roon Investigating]
The specific symptom is neither remote (controller) disconnection to the broker nor audio dropouts. Instead, you’d see Zones disappear in the Roon Settings → Audio page.
In this case, diagnostics tell a different story. The prebuffer is failing over Airplay in several instances, and clients disconnect repeatedly from the broker. The loopback remains in tact.
Logs point to traffic routing as the primary issue here. There’s a second ethernet interface active on the RoonServer machine; instead of focusing on the splitter, let’s start by restricting this machine to a single ethernet interface using the same subnet as the client controllers.
We’ll watch for a response. Thanks for your patience.