A few questions that might narrow things -

Which version of Samba are you using?
What does the idmap backend configuration for winbind look like?
Does testparm yield any errors?
Do getent group and wbinfo -g return the expected results?
Are nsswitch.conf and PAM configured for authentication?
http://www.enterprisenetworkingplanet.com/netsysm/article.php/3502441/Join-Linux-to-Active-Directory-With-Winbind.htm

On 05/22/2012 1:01 PM, Newman, John W wrote:
Thanks..

Unfortunately neither suggestion worked

chgrp still just says "invalid group"

valid users  = @"DOMAIN\\My Group" behaves the same as I described in the OP.  
Valid credentials = access denied ; invalid credentials = invalid name or bad password.   
 I already tried all sorts of things in valid users, but nothing is the magic string I 
need.

Any other ideas?

Thanks for the help so far, much appreciated!!

-----Original Message-----
From: samba-boun...@lists.samba.org [mailto:samba-boun...@lists.samba.org] On 
Behalf Of steve
Sent: Tuesday, May 22, 2012 04:59
To: samba@lists.samba.org
Subject: Re: [Samba] Grant only one AD group to samba share ?

On 21/05/12 23:36, Dale Schroeder wrote:
On 05/21/2012 3:42 PM, Newman, John W wrote:

Thanks for the suggestion, but .. that doesn't work ...


chgrp My\ Group /media/share
chgrp: invalid group: `My Group'


"My Group" is a windows AD group, not a local linux group. The
machine is "joined" to the windows domain through "net ads join", but
I don't think the security is that tightly integrated. I don't have
windows groups mapped to linux groups I've created or anything like that.
chgrp is expecting a linux group. Right?

Probably I am missing something, or you guys need more information.
Any thoughts?
Hi
Sorry. I forgot about winbind (we use nss-pam-ldapd). With winbind running that 
should read:

chgrp MYDAOMAIN\\My\ Group /media/share

Cheers,
Steve
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