We’ll require a little bit more information in order to take action here.
Our diagnostic servers show that Roon Server might be hosted on a Windows machine. Are you able to access Roon on that particular computer, or is it all your devices that can’t connect?
Please first ensure that you’ve added Roon to the safelist for any firewalls:
Our diagnostic servers also indicate that your server might have multiple network interfaces available. If you have two networks or subnetworks set up in this space, you’ll need to ensure all your Roon devices are connected to the same subnet. Here’s a guide for how to check:
Please share a screenshot of what you encounter when you open Roon on your PC (or any remote).