Arc connection issue with open port

[Luca_Celli]

Roon Server Machine

Nucleus+

Networking Gear & Setup Details

1. Who is your internet service provider?
   fastweb
2. Please list the make and model of your modem and router?
   Fastweb router
3. Do you have any additional network hardware, like additional routers or managed switches?
   Netgear r6800
4. Does your network have any VPNs, proxy servers, or enterprise-grade security?
   No

Connected Audio Devices

Description of Issue -

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

{
“ipv6_connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“ipv4_connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“93.kkk.lll.nnn”,“actual_external_ipv6”:“2001:aaa:bbb:ccc:ddd:eee:fff:ggg”,“router_external_ip”:“100.hhh.iii.jjj”},
“status”: “status”: MultipleNatFound
,
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“192.168.1.254”,“found_upnp”:true}
}

[connor]

Hi @Luca_Celli,

The snippet you’ve shared indicates that a second, redundant network address translation layer (NAT) sits between RoonServer and the upstream internet.

This NAT layer is usually in the form of a second router. If you’re using a second router, then you’ll need to follow these instructions to set port forwarding rules manually in both routers that point to the IP address and port from Roon Settings.

ARC Port Forwarding

Sometimes, the second NAT layer is at the level of your internet service provider, fastweb. We’re not familiar with every ISP, but it does appear that fastweb has implemented CG-NAT, which will block ARC.

You’ll need to reach out to your provider’s customer service, in that case, to request a dedicated external IPv4 address.

[Luca_Celli]

Hi Connor, I’ve already opened the port in both the router. I tried also to set the 2nd router up as AP but I still had same issue