The diagnostics @Suresh_Kamath provided suggest that the Core is having difficulty reaching Roon’s servers. There are several independent factors that can cause this error, so Roon recommend double-checking the following to initiate troubleshooting:
Is your router firmware up to date?
Do you have any VPNs, proxy servers, or enterprise-grade security on this network?
Are you experiencing any issues with Roon Remotes, or other apps on your local network?
If you continue to experience difficulties, please tag the support team and include the following information:
What is the make and model of your modem and router?
Do you have any additional network hardware, like additional routers or managed switches?
Who is your internet service provider and what is your geographic region?
Is your Modem configured in Bridge Mode so that it operates only as a modem or do you have the ports forwarded on both?
Thanks. I tried al that and no joy. I checked with findmyopenport and no port is open.
I have asked my service provider for a fixed IP. I understand that when I have fixed IP, my port will be opened. Let me try this in the meantime if it works.
@Suresh_Kamath, the ARC error message seems to identify that your Airtel DZS modem/router remains in routing mode, not bridge mode. Can you disable UPnP on the Orbi router and attempt the following port forwarding rules on your Airtel and Orbi systems:
Create a port forwarding rule on the Airtel forwarding to the IP address of the Orbi main router using the port number listed in your Roon Settings → Roon ARC tab (I believe from your screenshots that is port 44135)
Create (or verify in this case) a port forwarding rule from the Orbi router to the IP address of your Roon Core NUC) using the ARC port number
I have two routers in my network and this approach worked for enabling ARC.
