Please list the make and model of your modem and router?
Do you have any additional network hardware, like additional routers or managed switches?
there is a fibre cable to lan box where I attach the Fritzbox
Does your network have any VPNs, proxy servers, or enterprise-grade security?
no!
Connected Audio Devices
Description of Issue -
What is the exact port forwarding error message you see in the Roon Settings → ARC tab?
It’s possible that your ISP has reserved the port assignment range to which Roon defaults. I recommend taking the following steps:
First, try toggling UPnP on/off in the Fritz!Box and attempting to auto-configure port forwarding.
Do you know if the fibre box you’ve mentioned above is functioning as a modem/router combination? If there’s a web administration for this device, make sure it’s in Bridge mode.
Lastly, as other users have helpfully suggested above, try manually typing in a different port number in Roon → Settings → ARC. If you’re setting a manual port forwarding rule in the Fritz!Box, make sure it matches the updated port. This will help us verify if your ISP has in fact reserved a certain port range.
We’ll keep an eye out for your response. Thank you!