Cannot initially select HD TV Channels, no data from TVH

Help and Support Raspberry Pi
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I’m not familiar with devices like the Kathrein but I’m surprised to see 127.0.0.1 in your log. Shouldn’t your TVH client be pointed to the Kathrein’s IP? Edit: maybe not. @JimKnopf may know.

There’s a HowTo in here for Fritz!Box which may help.