After adding a new Cerberus native user, assigning a root directory for sftp to the user and restarting cerberus service everything is working fine. The user is able to connect to the the sftp and upload files to the subfolder of the root directory.
But after a while the rights seem to “disappear”. When the user connects again the subdirectorys are not visible anymore and it seems the user has no rights anymore.
Restarting cerberus service helps for a while (~1 hour) and then the story repeats. Meanwhile no changes were made in cerberus or the physical directory.