On my Tru64 4.0F machine I've installed 2.0.5a. I added a number of users en masse and added them all to a certain group. It seems that Tru64 likes to put a limit on the number of users per group definition by making multiple group entries in /etc/group, at least when creating accounts with adduser. For example: ... dudes:*:1000:user1,user2,user3,... dudes:*:1000:user31,user32,... To Samba, those users who appear in the second line do not belong to the group. Users in this second line cannot connect to certain shares because of group permissions (valid users = @group). I edited /etc/group by hand and simply put the two group entries into one and now life is fine. Is this a problem with Samba?