If you van to use UserOwner and/or GroupOwner to change the user and group on directorie and file credentials at upload by FTP (ProFTPd) the this won't work out of the box.
NOT WORKING
<Directory /path/to/dir>
GroupOwner uploaders
UserOwner uploaders
</Directory>The solution to solf this problem [SOLVED] is to eliminate the mod_cap module. Add this directive in your proftpd.conf file.
Solution
<IfModule mod_cap.c>
CapabilitiesEngine off
</IfModule> Thanks to "castaglia": http://forums.proftpd.org/smf/index.php/topic,1207.0.html
See also: http://www.castaglia.org/proftpd/modules/mod_cap.html