· Roon ARC says: "There's an issue with your" Roon Server. Your Roon Server is online, but there's an issue thats's preventing access...". How can I configure my TP-Link Archer C3200 router for ARC Port Forwarding? What is the port (XX), protocol (TCP), External port (55000 ?) and external protocal (TCP). Please advice how to setup my router for correct ARC Port Forwarding, so I can access Roon via the Roon ARC app, when I am not at my home.
Tell us about your home network
· TP Archer C3200
mjw
(Father! Father! Resist not! Let us destroy the core! Set us free!)
2
In essence, on the port forwarding (virtual server) screen you add the following information.
Service port: 55000
IP address of Roon server
Internal port, also 55000
Protocol: TCP
Enable the service (tick box)
The XXs indicate either one or more ports, or a range may be used.
Please follow the recommendation provided by @mjw it will allows you to setup the port forwarding correctly.
However, sometimes ARC connectivity issues are not only related to port forwarding. They can also be caused by carrier-grade NAT (CG-NAT) or other network configurations that prevent incoming connections to your server.
To help isolate the problem, we recommend:
Run an ARC diagnostic from your Roon Core:
Open Roon → Settings → Roon ARC
Share the report if possible.
Verify your port forwarding setup on the router matches the IP of your Roon Core.
Once we have the diagnostic report, we can confirm whether this is a port forwarding issue or a CG-NAT / network-level limitation.
Thanks. I tried turning off UPnP and restarted the router, but I still have the same issue.
mjw
(Father! Father! Resist not! Let us destroy the core! Set us free!)
7
Error 526 is a Cloudflare-specific error indicating an “Invalid SSL Certificate.” Since Roon ARC relies on Cloudflare’s infrastructure to establish a secure connection this means something on your local network is intercepting the secure traffic and replacing the SSL certificate.
You may have some advanced security setup in your router that is changing the secure connection. You may aslo check if your Roon server is allocated a static IP by the router, as this could help.
However, please wait for Roon @support to assist further.
Regarding the Error 526 you noticed in the diagnostics: our team has confirmed that this was a temporary issue on the Cloudflare side that has since been resolved. It was essentially a “false positive” error message that didn’t accurately reflect your local network state.
Since you have already configured the Virtual Server (Port Forwarding) and disabled UPnP as suggested, the connection should now be able to establish correctly.
Please try the following to confirm:
Go to Settings > Roon ARC in your Roon app.
If the settings you applied in your TP-Link Archer C3200 are correct, you should see a “Ready” status now. Please let us know if the error persists or if ARC is now working as expected!
Nothing to do with your router settings. Error 526 is a Cloud issue - that I think has returned following the DDOS attack 2 days ago. It’s been flagged to Roon Labs, but it is the weekend, so your patience would be appreciated.
If you are seeing the “Ready” status in Roon Settings -> Roon ARC, this is great news! It confirms that your port forwarding rule is working correctly and that Roon’s cloud servers can successfully reach your local Roon server from the outside world.
Since the server side is verified as working, the issue likely lies somewhere in the connection path between your specific mobile device and your home network.
Could you please check the following on your mobile device?
VPNs / Firewalls: Do you have any VPN, ad-blocker, or firewall apps active on your phone (e.g., DuckDuckGo App Tracking Protection, private DNS, corporate VPNs)? These can sometimes block the handshake ARC needs. Please try disabling them temporarily.
Reinstall ARC: Sometimes cached authentication data gets stale. Please delete the Roon ARC app entirely and reinstall it.
Test a Different Network: To rule out carrier-specific blocking on your mobile data plan, could you try connecting your phone to a different Wi-Fi network (e.g., a friend’s house or a coffee shop, not your home Wi-Fi) and see if ARC connects?
