Hi, I have still problems in restricting the access to calendars. I found a lot of information here: https://trac.calendarserver.org/browser/CalendarServer/trunk/doc/Extensions/... And I tried my luck on the CalDavClientLibrary If I set the auth-system to clear-text I'm able to login as admin user, but the I recieve something like: {DAV:}current-user-privilege-set: 401 what means "not allowed to" if I understand correctly I enabled admin as AdminPrincipal: <key>AdminPrincipals</key> <array> <string>/principals/users/admin/</string> </array> added it to the accounts.xml adding it to the sudoers.plist makes me lots of errors <dict> <key>username</key> <string>admin</string> <key>password</key> <string>admin</string> </dict> I cannot login with the CalDAV-Tool anymore thanks for any comment Georg