Roon Core cannot be accessed by Roon ARC via AVM Fritz!Box

[Graeme_Finlayson (The Mad Scientist)]

Have you tried manually setting the port forwarding rule for ARC?

ISPs and Routers: List of Known Solutions and Workarounds

Routers and ISPs General Router Instructions How To: Roon ARC with Zen WiFI AX Router Port Forwarding Instructions for (Most) Fritz!Box Users North America ISP-Specific Hardware Bell Canada: Home Hub 3000 (single modem/router setup) Bell Canada: Home Hub - How to Set Up Alternative to “Bridge Mode” by (Safely) Configuring Advanced DMZ Verizon USA: Verizon Fios with Netgear Orbi Comcat USA: Comcast XB6-T modem/router Xfinity USA: VOIP Telephone Connection Between Modem & Router AT&T USA: AT&…