sorry I’m not a network specialist, I like to listen music, even worce: I don’t understand a word of all these shortcuts.
Even with te tekst below here I can not manage.
For the record: of everything I have the latest updates (Os-X, Router, Roon)
The comments for the problem are
Yess thank you @Martin_Webster and @Ratbert ; yes making screenshots is not the problem. Getting Arc to work would be great. Thanks for your message Ratbert, I I will answer that first now.
Put simply, this error code means that UPnP is not properly functioning in the router. UPnP autoconfigures port forwarding for ARC. If it’s not working, there are usually two workarounds:
First, enter the Fritz!Box settings and turn UPnP off and back on. Restart RoonServer. UPnP should be prompted to autoconfigure ARC again.
If that doesn’t work, then re-enter the Fritz!Box web administration page and turn UPnP off entirely. Instead, in the Port Forwarding section, create a TCP-protocol port forwarding rule that points to the Port Number and IP Address listed in Roon Settings → ARC>
If you’re still stuck, then you’re likely up against a level of carrer-grade network address translation put in place by your internet service provider. This would be outside Roon’s control, unfortunately, but you can often work around it by requesting a dedicated IPv4 address, native IPv6, or installing a peer mesh VPN like Tailscale.
Please post here once you’ve tried steps 1 and 2 above and we’ll continue to help you.