Unable to Connect ARC Outside Home Network - Error 504 (ref#ABFYQ7)

[Pang_Yu_Zhi]

What’s happening?

· I'm having trouble with Roon ARC

What best describes your issue with ARC

· Other

How can we help?

· None of the above

Other options

· Other

Describe the issue

Not able to connect ARC outside home network. Error message

{
"ipv4_connectivity": {"status":"NetworkError","status_code":504,"error":"error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined"},
"external_ip": {"actual_external_ip":"210.ddd.eee.ccc","actual_external_ipv6":"null","router_external_ip":"null"},
"natpmp_autoconfig": {"server_ip":"192.168.50.1","found_natpmp":true},
"upnp_autoconfig": {"server_ip":"192.168.50.1","found_upnp":true,"error":"doaction request return statuscode: UnknownError"}
}

Describe your network setup

Asus BQ16 to edge router in switch mode then to melco S10 switch

[noris]

Hello @Pang_Yu_Zhi ,

Thanks for reaching out with your report. Is this a new issue, was ARC previously working and this behavior just started recently? Have you set up a manual port forwarding rule in your router?

[Pang_Yu_Zhi]

Noticed this after changing to the new router.
I have setup port forwarding but it doesn’t solve

[connor]

Hi @Pang_Yu_Zhi,

Who is your internet service provider? Diagnostics indicate you might be behind a layer of carrier-grade NAT (CG-NAT), which the providers in your geoIP region commonly implement. CG-NAT will block ARC, requiring you to either a) ask your ISP for a dedicated IPv4 address or b) install Tailscale instead.

Here’s a detailed guide for Tailscale setup. https://help.roonlabs.com/portal/en/kb/articles/arc-and-tailscale-connect-to-roonserver-without-port-forwarding

Let us know if we can help further. We’ll watch for your response.

[connor]

Hi @Pang_Yu_Zhi,

We haven’t seen a response on this thread, but please see the above post for more detailed info and some workarounds. This thread will close without a response from the original poster after another day. Thanks!