NetworkError 504 on NucleusOne with Tailscale and Roon ARC settings (ref#ITE17U)

[Roth_Hensley]

Hi! What’s not quite right with Roon?

· Can’t reach my Server, remotes or ARC

Can’t connect to my Server, remotes or ARC

· Other ARC issues

Tell us what's going on

· Installed Tailscale and both my iPhone and NucleusOne appear with green dot. But when visiting Roon ARC settings on NucleusOne testing continues to fail with NetworkError code 504.

Tell us about your home network

· Eero App version 6.651 | Tailscale installed on iPhone and on NucleusOne

[BlackJack]

This diagnostics page is meant for ARC using port forwarding. As you use VPN instead, please ignore that page. Does ARC work for you using the VPN (Tailscale)?

[AceRimmer (Smoke me a kipper, I'll be back for breakfast!)]

That is to be expected.
As brother @BlackJack states…
Does it actually work or not?

[vadim]

Hello @Roth_Hensley,

This is expected behavior when using Tailscale.

The ARC diagnostics page only tests direct inbound access via port forwarding (WAN → router → Nucleus).
When Tailscale is enabled, ARC uses a VPN tunnel instead:

Phone → Tailscale → Nucleus

There is no open inbound port for ARC to probe, so the test fails with NetworkError 504 even though ARC works correctly.

The only real test is:

• Turn off Wi-Fi on your phone
• Keep Tailscale enabled
• Open ARC and try to play music

If ARC plays, everything is working.

[connor]

Hi @Roth_Hensley,

The ARC settings and diagnostics page in Roon itself is admittedly a little clunky - the team has ongoing work in the pipeline to overhaul this page.

The important distinction is whether ARC Settings page itself shows a solid, green-light connectivity status to the RoonServer.

We’re going to allow this topic to auto-close shortly without any further responses, so please reach out in the meantime if we can assist further.

Thank you!

[Roth_Hensley]

Black Jack was absolutely right. Took ARC out for a spin with TailScale and works like a charm. Now discovering what TailScale can do within my home environment. It is very helpful that TailScale comes pre-installed on the Nucleus One. As noted, the diagnostics page ignoring TailScale was a stumbling block for this newbie. But no big deal once understood. I appreciate all the feedback.

[connor]

Thanks for circling back to let us know, @Roth_Hensley, and we’re glad to hear you’re off and running.

The team is overhauling the Roon Settings → ARC page to not display erroneous diagnostics. You should see this reflected in one of the upcoming Roon builds.