But with a user (registrered) i just can upload a file, but get a "#403 You have no permission to access this site", trying to reach the file (via "/http://index.php/component/sobipro/download/file?fid=39.106&Itemid=0"

If i set the registred User to Joomla-Admin-Group, the user get access.
The Sobigroup:
