[Samba] samba 4.1.7 member server errors trying to access share(s)

[steve]

On Wed, 2014-05-28 at 13:45 +0200, L.P.H. van Belle wrote:
>  Ok, 1 thing extra works. (2)
> 
> 1) DOMAIN\Administrator works fine everywhere. 
> 
> 2) DOMAIN\someuser	works fine now on all my servers  ( forgot to put the site in the intranet sites) 
> 
> 3) Domain\Admin		works fine for the webmail SSO, but not for the shares on the member server, popups domain auth. on the DC it works. 
> 
> but Admin.. still no go.. 
> as Admin is member of Domain Users, it should work imo.. 

Dunno.
Check?
samba-tool group listmembers Domain\ Users | grep 'Admin'
can you id or getent Admin?

hit it harder?
valid users = @"MYDOMAIN\Domain Users", MYDOMAIN\Admin