Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/03785d5d8c80e4b845b1237e3b99ed8c1f8a0a07/third-party/TeensyTimerTool/examples/01_Basic/ArrayOfTimers You should set ROOT_URL correctly, otherwise the web may not work correctly.