Can’t connect ROON ARC with my BT Smarthub 3

[Formula]

You need to do the same on your Synology. Login to the DSM and add port forwarding.

I saw a post about an hour ago saying the same thing and that’s how he fixed it.

Found it;

Roon ARC with Core on Synology

Hi all, this took me a while to figure out so I thought I’d share if anyone else is having issues: If you correctly enabled port forwarding on your router and the Roon ARC apps still cannot connect to your Roon Core running on your Synology or comparable NAS, remember to also open the same port in your Synology firewall settings. Once I opened the ARC port on my Synology as well the apps were able to connect instantly. Hope this helps.

I hope that works/help.