Can't connect Roon ARC even if UPnP enabled

Roon Core Machine

Roon ROCK version 2.0
Running on an Intel NUC

Networking Gear & Setup Details

  1. Who is your internet service provider?
    PLDT Fibr in the Philippines

  2. Please list the make and model of your modem and router?

  3. Do you have any additional network hardware, like additional routers or managed switches?
    TPLink Deco M5

  4. Does your network have any VPNs, proxy servers, or enterprise-grade security?

Connected Audio Devices

Description of Issue -

What is the exact port forwarding error message you see in the Roon Settings → ARC tab?

“connectivity”: {“status”:“NetworkTimeout”,“status_code”:998,“error”:“”},
“external_ip”: {“actual_external_ip”:“”,“router_external_ip”:“”},
“status”: “status”: MultipleNatFound
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“”,“found_upnp”:true}

Hi @Antonio_Rivera,

It appears you have multiple NAT running which means that both the router of your ISP and your TP Link Deco perform NAT. You can read about multiple NAT and how to solve it in this article:

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Hi @Antonio_Rivera,

Welcome to the forum.

I agree with @Joost_Hoogland that there is a multiple NAT in your setup.

When i look at the error message i think your ISP is using CG NAT. I think it’s CG-NAT because the router_external_ip starts with 100.

See below article for what CG-NAT is.

What is Carrier Grade NAT

DrayTek - Routers, Firewalls, Switches, Wireless Management, 3G/4G and IP PBX products

In this article you will see this:

Recognising GCNAT Address Ranges

CGNAT has its own reserved IP range between and

You could contact your ISP and ask the following questions (don’t made this up myself, just copied from @benjamin - Roon Staff: Technical Support).

  • 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?

Hope it helps.

Kind regards,


1 Like

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