Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/OpenAudio_ArduinoLibrary/src/commit/15d54e0db2be5b9e74c686a5fa9a8e43039f35a8/utility You should set ROOT_URL correctly, otherwise the web may not work correctly.