Hi @Thomas_Schaller,
My apologies for the sudden splitting of your post into a new topic thread.
Typically, errors can be caused by a misconfigured Port Forwarding setting, if you are not seeing Ready listed in Roon Settings -> Roon ARC, please look over this guide before proceeding.
I also recommend you peruse our Fritz!Box guide that we assembled during Beta testing, with the help of users: Port Forwarding Instructions for (Most) Fritz!Box Users
If you have reviewed this guide and still have not resolved the issue, can you provide the following details about your network setup to help expedite troubleshooting?
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Who is your internet service provider?
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Please list the make and model of your modem and router, particularly if you have more than one router in your setup?
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Do you have any additional network hardware, like additional routers or managed switches?
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Does your network have any VPNs, proxy servers, or enterprise-grade security?
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What machine are you using as a Roon Core, and how is it connected to the internet?
Thanks!