Error message when setting up Roon ARC with router configuration: MultipleNatFound (ref#WNL3BY)

Support ARC: Port Forwarding Help
1

Network Setup

· I use a single personal router not provided by my ISP

ARC Status

· ARC is *Not Ready*

Roon Error Code

· None of these are listed. It simply says "TIMEDOUT" or similar.

System or third-party *firewalls *or *antivirus software* can sometimes block RoonServer from reaching ARC.

·
Try adding RoonServer and its associated processes to the whitelist of any firewalls or antivirus software you have installed, including the Windows system firewall, if applicable.
[You can learn more about firewall exceptions with Roon here.](https://help.roonlabs.com/portal/en/kb/articles/firewall)

Has the status in Roon -> Settings -> ARC changed after adding exceptions in your firewalls and antivirus software for Roon?
ARC is still *Not Ready*

Don't give up yet.

· I'm stuck. I'd like to create a post to ask Roon Community for help.

Describe the issue

I have set up the router as follows:
X Transfer status information via UPnP
X Autonomous port release Rhein-Z1-V2 (1 active)
Nevertheless, I get the following message when setting up Roon ARC:
{
"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":"149.kkk.vvv.mmm","actual_external_ipv6":"2a02:aaa:bbb:qqq:rrr:sss:ttt:uuu","router_external_ip":"100.nnn.ooo.ppp"},
"status": "status": MultipleNatFound
,
"natpmp_autoconfig": {"status":"NotFound"},
"upnp_autoconfig": {"server_ip":"192.168.2.1","found_upnp":true}
}

Describe your network setup

Router: FritBox 7490
ISP: Entega (Link: https://www.entega.de/glasfaser-internet-darmstadt/)
Core: Silent Angel Rhein Z1 Plus (16GB/250GB)
OS: 2.0 (build 1413) 64-Bit

2

What type of connection do you have? Any ISP hardware at all or direct connect to fiber?
Multiple NAT usually implicates that there are two “routers” in play and that you will need to either bridge one of them or implement port forwarding.

Have a read through and this to see what might work for you:

3

I have read through the “ARC Port Forwarding” page several times and tried all the advice, but to no avail. My configuration consists of a rooter (Fritzbox 7490), to which the Roon core (Rhein Z1) OS 2.0 (build 1413) 64-bit and a NAS (Synology DiskStation DS1125j) are connected. My firewall allows all Roon applications. My ISP can’t tell me whether I have a dual-stack or DS-Lite connection, but he says that private customers don’t have a fixed IP address.

4

Uou need to ask them if tjey are using cgnat. You don’t need a static ip, but you do need a public facing ip.

5

Yes, my ISP uses CGNAT. I don’t have a public IP address in the V4 area, but I do in the V6 area. It will stay that way because of the shortage of IP addresses.

7

Hi @Willi_Kehr,

If the second layer of network address translation is upstream of your account, you’ll need to rely on a third-party tool for NAT traversal. We recommend Tailscale - please see here:

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