Hi
I have a similar issue with my 2018 Mac Mini which is our home’s Roon server.
Yesterday, I updated it to Sequoia 15.01 and Roon continued to work OK. This morning, however, the Roon server was unavailable. When I logged into the Mac Mini to look into the problem, Roon was running, but no audio zones were visible. After looking around the forums, I decided to restore Roon from a recent backup. That didn’t fix the problem. Then I came across a post that mentioned the Local Network toggle. When I checked to see if Local Network was set, it was, but I unset and reset the toggle anyway. Instantly, the audio zones came back. However, I still couldn’t see the server on any of remotes - hardwired Macs or iPhones or iPads etc. I restarted the Mac Mini to refresh network connections and once again, Roon on the Mac Mini wasn’t displaying any audio zones. I unset and reset the Local Network toggle and the audio zones returned.
It seems the problem occurs after startup - my Mac Mini is scheduled to shut down at night and restart in the morning (to save power - it’s an Intel machine), which is why it worked OK yesterday, but not this morning.
I’ve restarted the Mac Mini a couple of times since and the same thing happens. I have to to toggle Local Network on again to get the audio zones back. I don’t believe it’s a network issue - all my Macs are on CAT 6 Ethernet. The Mac Mini is only used for serving music and only runs two other apps apart from Roon. Both of these apps maintain their Local Network permissions after a restart. It seems to me that the issue is between MacOS Sequoia and Roon Server and until it’s fixed, it looks like I’m going to have to log into the Mac Mini every day to reset the Local Network toggle.
BTW - The Roon remote issue - “Waiting for your Roon Server” - was fixed by choosing “Select a different Roon Server” which allowed me to reconnect them to the Mac Mini.