Hello @Martin_Kogel,
Thanks for contacting support, I’d be happy to take a look over this issue with you. Can you please post a screenshot of the router’s DNS Rebind settings page? I have not previously heard of reports affecting DNS rebinding but it is possible.
If there is a way to set firewall exceptions in the router for specific ports, the ports that Roon uses can be found here, (please make sure to include both Roon.exe and RAATServer.exe):
Have you changed any settings at all on the repeaters? Is Multicast enabled on both the Router and the Repeaters? If you connect one of your Roon Remotes directly to the Cable router, does it show up properly then? If all else fails, is there a way to downgrade the firmware to the previous version on the Router and verify if the same behavior occurs? Please let me know when possible.
Thanks,
Noris