ARC no longer operational after updating to Dream Machine (ref#0IOA8F)

[Ricardo_Damborenea]

Network Setup

· I use my ISP's router alongside a personal router.

ARC Status

· ARC is *Not Ready*

Roon Error Code

· “natpmp_autoconfig”: {“status”:“NotFound”}, “upnp_autoconfig”: {“status”:“NotFound”} }

Have you successfully located and enabled the UPnP or NAT-PMP settings in your router's web UI?

· I've turned UPnP/ NAT-PMP on and ARC won't connect

Select the Diagnostic Keyword or Text String

· Something else

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 stopped working after update to Dream Machine

Describe your network setup

Telefonica//Telefonica modem//Dream Machine//Cabled//Mac Mini 4 os mojave

[Ricardo_Damborenea]

[Ricardo_Damborenea]

The update might have changed something in the settings as until yesterday everything worked fine.
Latest version: UniFi OS 4.3.6; Network 9.3.43

[mjw]

@Ricardo_Damborenea

Dream Machine

Is this an Ubiquiti gateway and managed switch? If so, the issue is probably related to the Dream Machine’s configuration, and you’ll most likely need to resolve this yourself, since Roon does not recommend the use of enterprise grade managed switches for use with Roon.

However, the diagnostics you’ve provided suggest that UPnP is not properly configured on your router.

Please first try the following steps:

• Try to enable UPnP/NATPMP in the web administration interface for the router directly upstream from your RoonServer
• Try to manually open the port in your router’s port forwarding configuration
• Make sure the IP/Port matches the Port listed in Roon → Settings → ARC
• Check for any VPNs or Firewalls that might be interfering
• Check if your modem is in Bridge mode

[connor]

Hi @Ricardo_Damborenea,

It’s the experience of users in this forum that Telefonica has implemented CG-NAT, which blocks port forwarding. The managed network implementation might be contributing to the blockage.

In either case, the workaround would be to rely on Tailscale for NAT traversal instead of port forwarding. This is easy to install alongside RoonServer and ARC, respectively, and creates a secure connection over cellular data.

See here for instructions.

[Ricardo_Damborenea]

…but everything worked perfectly until today with Telefonica and the only thing that has changed is the Dream Machine upgrade. And Telefonica says they don’t use CG-Nat…

[Ricardo_Damborenea]

thanks! i’ll try all what you suggest and I can as now I’m in remote for the next 2 months. Murphy’s law…

[Ricardo_Damborenea]

While I couldn’t solve it yesterday after several server (and router) reboots, it fixed itself after my daily programmed server reboot tonight. Strange…