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Old 02-18-2015, 10:33 AM   #1
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Registered: Feb 2015
Posts: 6

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SAMBA 4.1 share enumeration fails

Hi, all.

I have a SAMBA 3.6 PDC in my home network, and it has multiple Win7 Pro/64 clients all running happily. I've introduced a SAMBA 4.1 box as a BDC, joined the domain, copied the relevant user files (smbpasswd, /etc/passwd, /etc/group), and can verify that domain users authenticate to the BDC via wbinfo -a.

Users can browse and use shares on the PDC with no issue. The new BDC, however, cannot be browsed by either the existing PDC or my Win7 boxes. SMBCLIENT can *connect* to the share, but ls always returns NT_STATUS_ACCESS_DENIED. When browsing the server, I get 'Error returning browse list: NT_STATUS_ACCESS_DENIED."

When browsing the machine-specific logs on the BDC, following the browse attempt, I see the following:

"service[$IPC]: requires encryptionSMBtrans ACCESS_DENIED"

So that tells me that the new SAMBA 4.1 server is employing a security model/protocol requiring encrypted access to the IPC share before returning a browse list, one higher up the food chain than that presently being used by the 3.6 box. Question is, which one? Again, all existing clients can browse all shares on the 3.6 box.

Anything that could point me in the right direction would be most appreciated!
Old 02-23-2015, 07:31 PM   #2
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Registered: Feb 2015
Posts: 6

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The resolution to this issue, which I post here for posterity's sake, actually came in two parts.

The first part, indirectly, was to solve a machine authentication issue to my PDC. The solution to that was to set the RequireStrongKey value to 1 in HKLM/CCS/Services/NETLOGON registry key each of my Win7/Pro boxes.

This value was 0 for all my Win7/Pro clients against my DC, which was Samba 3.3.4 at the time. Then, for apparently only a brief time, RequireStrongKey=0 was thought to be a correct setting for Win7 boxes to join a Samba domain. Apparently, some later discussions between Samba devs and Microsoft about protocol negotiation for Samba and Windows boxes led to a change that, ultimately, forced RequireStrongKey=1.

During my research on this issue, I noticed that the machine authentication failures occurred *after* I updated the server from 3.3.4 to 3.6.24. Doing so actually made the RequireStrongKey=0 value wrong. Changing that, and then restarting the NETLOGON service, fixed the problem, which was verified by the NLTEST tool resyncing to the DC. Doing that forces the machine to re-authenticate to the domain, proving the trust relationship was fixed.

The second part of my problem was in realizing I had disabled NTLMv2 authentication on the Samba 4.1 server, forcing it to a default of SMB3, which obviously Windows 7 doesn't do.

Both problems solved.

Last edited by OklahomaDave; 02-23-2015 at 07:38 PM.


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