Cannot connect Roon ARC due to NetworkError with ETIMEDOUT (ref#WPW3V3)

Support
2

Hey @weiss.marko,

Thanks for writing in! The important part of the error code above is:

"status": MultipleNatFound

The port forwarding diagnostics you’ve provided suggest there is a redundant layer of network address translation preventing port forwarding. This prevents ARC from recognizing the external IP address of your home network. 

The second layer of NAT can either be at the local-network level (commonly as a result of two routers), or at the level of your service provider (called “carrier-grade” NAT, or CG-NAT). 

Solution:

If your setup involves an ISP-provided gateway (modem/router combination) and your own third-party router:

  • In the web administration interface of the ISP-provided gateway (modem/router combination), enable Bridge Mode or equivalent, where the ISP-provided gateway does not have DHCP routing enabled. 
  • Alternatively, if you have already created a manual port forwarding rule in your 3rd-party router, you can add an additional rule to forward the port through the ISP/second router.
If you only have one router in your setup or your modem is already in Bridge mode, please take a look through our list of known router and internet service provider solutions, as other users may have already encountered the same situation:

You can reach out directly to your service provider to ask if they support port forwarding; this question will often enough to prompt them to explain whether or not the carrier-grade NAT they’ve implemented can function with ARC.

Additional Notes:
The MultipleNAT error is not reported unless UPnP or NATPMP is working. Since these protocols configure port forwarding automatically, once you’ve removed the cause of the MultipleNAT error, port forwarding should automatically configure in Settings -> Roon ARC.