Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/esp-link/commits/commit/0d2eed195727251f5fbfe8b0822751fbb3c3edc3/espfs/mkespfsimage/Makefile You should set ROOT_URL correctly, otherwise the web may not work correctly.