Sorry this thread sorta died. I read through some of the comments and I think we can move forward.
You mentioned you had a Linksys WRT router, and you also had a Unifi AP. When I had a Unifi thing recently, I also had a Cloud Key and a Unifi Security Gateway. Is the Unifi AP to extend your WiFi network?
Alright, down to business. What’s the ip for the computer running Roon server? What is the gateway on there?
Let’s say the gateway is 192.168.0.1
When you go to the gateway IP, is that your Linksys router?
Log into it, check out the WAN interface. Look for the IP in there.
Now go to whatismyip.com and see if that IP matches your WAN IP. If it does: excellent you’re in the right place. If it doesn’t we have more network digging to do.
Here’s a thread I wrote recently that has some pictures that might help. Oh, which reminds me: the computer that has Roon, is it a windows machine? Temporarily turn off all Firewall, virus scanners and security stuff.