I have installed a Samba 3.025a PDC and 2 member servers. All on solaris. (The Samba PDC replaced a NT4 PDC. Account data was migrated with the "net vampire" command.) All solaris machines use NIS. On the PDC i created group mappings between the NIS groups and the Windows groups. I can access file shares on all machines from Win XP or Win 2000 clients. On the security properties of a directory on the PDC , I can view and set user and group permissions. The users and groups show the correct doman. For example, assuming the domain is "ACME", "johnsmith (ACME\johnsmith)" "sales (ACME\sales)" On the member server shares, I can attempt to add users and groups from the "ACME" domain, but they don't stick. Permissions set on the unix level show up as "johnsmith (unix user\johnsmith)" "sales (unix group\sales)" This is the sunfreeware build of samba, with acl support enabled by default. Solaris supports acl's so I can add multiple groups or users on the solaris level. And I do seem to have the proper access. Logs on the member servers show [2007/09/17 16:02:17, 0] smbd/posix_acls.c:create_canon_ace_lists(1423) create_canon_ace_lists: unable to map SID S-xyzxyz--xyzxyz-xyzxyz to uid or gid. ) When I created the group mappings, I explicitly set RID's. (Domain Admins = 512, sales=10001 etc) I am not running Winbind on any machine since I am not attempting to do unix level authentication against the samba accounts. Advice is appreciated Thanks