Acces plex web GUI via hostname not possible (Request came in with unrecognized domain Host; treating as non-local)

I spent several days now re-configuring my router with dd-wrt because of some weird dns problems.
Now I can access my NAS again with my hostname like nas.lan:whatever-port.

All my server applications work except plex.

In Plex Media Server.log it says
Request came in with unrecognized domain / IP ‘emma.lan’ in header Host; treating as non-local

What can I do against this problem except chaning my dns settings? It’s totally excluded that someone needsa to change his dns settings to get acces via hostname.

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