Hi @Bogdan_Delcea ---- Thank you for the report and sharing your feedback with us! The insight is appreciated.
Moving forward, based on the symptoms you are describing, at first glance this feels like something is could be blocking RAAT server (our streaming protocol). Can you please confirm for me that the mentioned iMac does not have any active firewalls or antivirus applications running on it. If it does, please disable these functions (temporarily) and confirm if this action triggers a change in behavior.
Furthermore, just to make you aware, the mentioned QNAP’s Celeron processor is a bit under our recommended spec for running Roon. Additional information on why this type of processor can lead to performance issues can be found here in our knowledge base and here, as mentioned by our CTO on the community site.
Lastly, If you don’t mind me asking, what links were you trying to access and having problems with?
-Eric