Connection to Proxmox Server not possible

Hi guys!

I'm completeley new to the world of Proxmox and home assistant (which should be running on my proxmox later). Unfortunately I run into problems after the first steps of setting up an home assistant server: I cannot access my proxmox server via web GUI.

First i checked my router (Telekom Speedport Smart 4). My old NAS and all other currently available network connections are displayed, but not the HP elitedesk with proxmox that I set up.

Then I tried some other LAN cables to check...

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