Network Setup
· Do you have a mesh network? (Google Mesh, Eeros, Ubiquiti, etc.)
ARC Status
· ARC is *Not Ready*
Roon Error Code
· ConflictInMappingEntry
What status do you see after changing the port?
· ARC is "Not Ready"
Don't give up yet.
· I'm stuck. I'd like to create a post to ask Roon Community for help.
Describe the issue
ARC stuck showing multiple phantom cores after migration to Nucleus One + Tailscale. I have migrated my Roon Core from Mac to a Nucleus One. ARC worked previously on the Mac-based Core. My network is a Netgear Orbi mesh system with no access to port forwarding (simplified app-only control). UPnP reports a port conflict (“Port already mapped to another device”), so classic ARC over port forwarding is not possible.
I have successfully connected the Nucleus One to Tailscale and confirmed connectivity (Nucleus Tailscale IP: 100.75.19.5). Tailscale is also active and connected on my iPhone.
Despite this, Roon ARC on iOS always immediately shows three Core options (“MacBook Air” and “Nucleus One” variants) and never connects externally. I have reinstalled ARC multiple times … logged out/in of ARC … disabled “Local Network” access for ARC … tested only on cellular (5G) … verified Tailscale connectivity on both devices.
The three Core options still appear instantly, which suggests that stale ARC endpoints are still being served from Roon Cloud rather than discovered locally.
Could you please perform a full server-side ARC backend reset for my account so that only the active Nucleus One over Tailscale is published?
Describe your network setup
ISP: Telenor Sweden
Netgear Orbi mesh system (router + satellites, app-controlled, no access to advanced router interface, no manual port forwarding available).
Fiber → ISP termination → Orbi main router → Orbi mesh nodes via wireless backhaul.
All home devices incl. Nucleus One connected via the Orbi LAN.
Roon Core running on Nucleus One (RoonOS) connected via Ethernet to the Orbi router.
ARC running on iPhone.
Both Nucleus One and iPhone are connected to Tailscale, and I can ping the Nucleus Tailscale IP (100.75.19.5) from other Tailscale devices
