Restricted network access

Links
- https://www.ulb.uni-bonn.de/en/news/11-12-2022-restricted-network-access/wartung_colourbox12613110.jpg/image_view_fullscreen
- https://www.ulb.uni-bonn.de/en/news/11-12-2022-restricted-network-access/wartung_colourbox12613110.jpg/@@download/image/_Wartung_COLOURBOX12613110.jpg