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/2a7e5c62dcfe91d7b47a9fdb3f932831d06450e2/examples/SignalNoise_float You should set ROOT_URL correctly, otherwise the web may not work correctly.