On July 30th a Box.UP update to a new Nextcloud version was carried out from 17:00 to 18:20. The update also changed the Box.UP login page.
Further details on the update and the new login page can be found at https://www.uni-potsdam.de/de/boxup/boxup-update#c731144
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Click here for Box.UP login: https://boxup.uni-potsdam.de/login