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/842c0bc53822efe1957d29087a5e56fdbb9c9b17/espfs/mkespfsimage/Makefile You should set ROOT_URL correctly, otherwise the web may not work correctly.