Hi @Sanjeeb_Rose,
Thank you for your patience and please accept our apologies for the delay. A few suggestions to help if you’re still stuck with port forwarding:
- Concerning instructions for the exception in the Ubuntu firewall, please see this thread: Roon ARC and Ubuntu - just need to open new port in firewall
There are several other related threads on Roon Community from users with similar setups.
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Do you have UPnP enabled in your router? You might need to set a manual port forwarding rule specifying the Core IP address and port number from Roon → Settings → ARC. This option should exist in your router web administration.
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Is the switch you are using a managed switch? What’s the make and model? As a test, try hardwiring the Core temporarily to the main router, if possible.