[Samba] domain-based DFS ?

Henrik Langos hlangos-samba at innominate.com
Wed Jul 2 10:48:31 MDT 2014

On 07/02/14 09:28, Davor Vusir wrote:
>> On our config it treats the domain as the name of the server! Anyway, thanks for your time. We can't spend any longer with this as we are looking for a solution.
>> Thanks again,
>> Steve
> Added uid, uidnumber and gidNumber to every account and group.
> Resulted in access denied to \\vusir.local\dfs\share and home
> directory.
> Commented 'idmap_ldb:use rfc2307 = yes'. No change.
> Removed uid, uidNumber and gidNumber from relevant accounts and access
> groups. No change.
> Removed uid, uidNumber and gidNumber from all accounts and access
> Groups. No change.
> Reactivated 'idmap_ldb:use rfc2307 = yes'. No change.
> A couple of restarts of the Windows 7 client, AD DC restarts and a
> server reboot. Back in business.

Hi Davor,

This pretty much matches my observations with domain based dfs. It's a 
hit and miss with lots of poking around in the dark.

Occasionally it works and all looks very nice, but then on the next 
login it might fail again. For me it was mostly failing.
(But then again I suspect it had to do with my removing one of the AD 
DCs and downgrading it to a normal member server. I've seen the former 
AD pop up in one of the DFS tabs as dfs root even though it wasn't a DC 
any more.)

Once DFS failed in the observed way, there is no point in logout/login 
The only thing that *sometimes* helps is a complete reboot of the client 
and hoping for the best.
This makes debugging the problem a very frustrating and time consuming 

Also smbclient and windows 7 show very different behavior.
In smbclient I can always at least see the dfs directory but access to 
the visible shares will fail.

$ smbclient -U sample12 '\\domain.local\dfs'
Enter sample12's password:
Domain=[DOMAIN] OS=[Unix] Server=[Samba 4.1.9-Debian]
smb: \> ls
   .                                   D        0  Mon Jun 30 20:53:09 2014
   ..                                  D        0  Thu Jun 26 13:17:10 2014
   test2                               D        0  Mon Jun 30 18:08:11 2014
   test                                D        0  Mon Jun 30 10:20:23 2014

                 64514 blocks of size 32768. 30984 blocks available
smb: \> ls test
session setup failed: NT_STATUS_LOGON_FAILURE
Unable to follow dfs referral [\shares01\test]
smb: \>

In Windows 7 I can see the dfs share when I go to \\domain.local\ but 
changing into that \\domain.local\dfs share results in an error.

In contrast to this, access via \\addchost.domain.local\dfs works 
reliably from Windows and smbclient alike.
Using this form I can even use smbclient with Kerberos authentication. 
(which fails for "domain.local" as there is no service principle for 
cfis/domain.local at DOMAIN.LOCAL in the Kerberos database.)

I'll put that topic away for now.


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