Network errors and UPnP configuration issues with Roon ARC (ref#U0WCWM)

Support
1

Network Setup

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

ARC Status

· ARC is *Ready*

Describe the issue

{
"ipv4_connectivity": {"status":"NetworkError","status_code":502,"error":"error code: 502
"},
"ipv6_connectivity": {"status":"NetworkError","status_code":504,"error":"error code: 504
"},
"external_ip": {"actual_external_ip":"91.aaa.bbb.ccc","actual_external_ipv6":"2003:ddd:eee:fff:ggg:hhh:iii:jjj","router_external_ip":"null"},
"natpmp_autoconfig": {"status":"NotFound"},
"upnp_autoconfig": {"server_ip":"192.168.178.1","found_upnp":true,"error":"<?xml version=\"1.0\"?>



s:Client
UPnPError


606
Unknown Error Code




"},
"multinat_autoconfig": {"status":"Failed","error":"Unexpected uPnP Control Response - See Log"}
}

Describe your network setup

Telekom, Fritzbox 7590 AX ; Lan , Win 11 Pro
The Roon server was moved to a new computer an hour ago. Until then, ARC had been working without any problems.

2

Hi @lutzboese,

Welcome back to the Roon Community! Thank you for providing the detailed diagnostic information.

Since you just migrated your Roon Server to a new Windows 11 Pro computer, the local IP address of your server has changed. Your Fritz!Box router is likely still trying to route Roon ARC traffic to the IP address of your old computer, which is causing the UPnP conflict (UPnPError 606) you are seeing in the logs.

To get ARC working stably on the new machine, the best approach is to bypass UPnP entirely and set up a manual port forwarding rule. Here is how to configure it:

Step 1: Check your ARC Port

  1. Open Roon on your new computer and go to Settings > Roon ARC.
  2. Note the Port number listed there (usually 55000 or 55002).
Step 2: Configure the Fritz!Box
  1. Log into your Fritz!Box 7590 AX administration interface.
  2. Navigate to Internet > Permit Access > Port Sharing.
  3. Delete any existing port sharing rules that were set up for your old Roon Server.
  4. Click Add Device for Sharing and select your new Windows 11 Pro computer from the list.
  5. Click New Sharing, select Port Sharing, and choose Other application.
  6. Set the protocol to TCP and enter the port number from Step 1 in both the external and internal port fields. Save the settings.
Step 3: Check Windows Firewall Because this is a new Windows 11 PC, the built-in firewall might be blocking the connection.
  1. Open the Windows Start menu and search for Windows Defender Firewall.
  2. Click Allow an app or feature through Windows Defender Firewall.
  3. Ensure that both Roon and RoonServer are checked for both Private and Public networks.
Once everything is saved, reboot your Fritz!Box and your Windows 11 PC, then head back to Roon Settings > Roon ARC to test the connection again.

Let us know if this gets you back up and running!