Well, let’s start with Android devices. In the cannot connect screen there is a blue Help link. This brings up a page to enter server IP. Instead of the actual IP enter
255.255.255.255
Your phone and desktop are also on 192.168.1.XX subnet.
Also,
See if there are any VPN’s running as that can cause issues.
Temporarily turn off the PC firewall and see if can connect.
Turn off IPv6 on the PC and Router and see if that helps
disclaimer, a fellow user here trying to help, not official support.
I have been having a very similar problem (out of the blue) for a week or two now. The web interface shows everything as OK; the apps (OS X, iOS or android) will occasionally show the nucleus/core as ready to connect (green dot), but when I try to connect everything hangs and eventually starts looking for the core again. I have powered off/on, rebooted, reinstalled the OS, and restarted the roon server, restarted the network etc, to no avail. I’ll follow this discussion for a while before putting in a separate support request if needed.
I wonder if Roon database corruption could cause these symptoms. There’s a way to move the database folder on Roon OS out of the way and start fresh with an empty database. If that works, you may be able to get in and restore a backup. A failing NVMe boot drive is another possible root cause. Connecting an HDMI display may reveal error messages if so.
Also having a lot of instability & shutdowns on the PC-side, started a couple of days ago. Never used the Android control app before, but downloaded it a few hours ago and it’s working fine, connects with the Roon Nucleus, can find new music on Qobuz, queues and plays tunes. When the PC end crashes, I can’t re-start Roon, or kill the process, only a machine reboot works. Another problem I hadn’t previously experienced is that a day after adding some albums to my library, the new ones had “lost” their cover art. I was able to restore those by manually telling Roon to re-identify each of those albums. I have Roon set up to automatically apply s/w updates, so I assume I have the latest version.
We’re very sorry to hear that connection to your Core from remote devices is not possible… .
It sounds like you have a Windows PC and a remote Android devices. If I didn’t miss anything, it looks like you haven’t tried reinstalling Roon on the remote devices. Could you please give that a try? Make sure you restart the device before installing Roon Remote fresh.
It’s 3 different android and 2 windows. But I narrowed it down to the roon server on top of roon os is restarting every 15 seconds…I also included logs from roon server.