I'm using winbind to map Active directory users and groups on a linux server. (debian sarge) in smb.conf this works valid users = DOMAIN+user but valid users = @DOMAIN+group seems to have no effect same problem with "write list"
change to version 3.0.21 problem solved for debian sarge users : add to /etc/apt/source.list deb http://us3.samba.org/samba/ftp/Binary_Packages/Debian sarge samba and update your system