Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/AutoConnect/src/commit/3f1c695e4e7c6bca3daf15877cd256da0b3f19c5/examples/mqttRSSI_NA
You should set ROOT_URL correctly, otherwise the web may not work correctly.