“MultipleNatfound” is the issue, there is more than one level of network address translation (“NAT”) going on, preventing ARC from working. Read Roon’s usual response on this below; based on what I see in your description it is most likely the second cause (Carrier-grade NAT) but I’ll copy the whole response to give the full picture:
This can either be at the local-network level (commonly as a result of two routers), or at the level of your service provider (in the form of carrier-grade NAT).
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: ISPs and Routers: List of Known Solutions and Workarounds
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.
More specifically, you can pass along the following questions:
Have you implemented carrier-grade NAT for my account level?
Have you fully implemented IPv6, or do you have IPv4 addresses available?
Can I request a static IPv4 address to support port forwarding?
Are there any ports you have reserved at the ISP level I should be aware of?
If you’re unable to locate an existing solution in our ARC: Port Forwarding Resources subcategory, please reach out to the Roon support team and include the following information:
What is the make and model of your modem and router?
Do you have any additional network hardware, like additional routers or managed switches?
Who is your internet service provider and what is your geographic region?
Is your Modem configured in Bridge Mode so that it operates only as a modem or do you have the ports forwarded on both?
Please see @Suedkiez comment above. The catch here is the MultipleNATFound line in the diagnostic message.
Do you have a modem/router in addition to the ASUS RT-AX58U you mention above? What about managed network switches?
If you don’t have two routers in your setup, then the second layer of NAT (network address translation) is quite likely at the level of your service provider. The questions posted above are worth passing on to their support team, as they may have an easy solution they can implement for your account to bypass or disable the carrier-grade NAT.
