[solved] [8.1.1] Samba access from Linux: protocol negotiation failed

Zapp! · September 16, 2017 at 12:11 PM

Hey all,

after the update to 8.1.1 I got Samba problems as well. I read the announcement at least three times to understand how the LibreELEC Samba configuration works and also googled a lot, but I still can't figure it out.

I run LibreELEC 8.1.1 on a Rpi3, minimum Samba version is set to 2, maximum to 3. I can access the Samba shares from Windows 10, however I can't access them from Linux (KDE neon user edition, based on Ubuntu 16.04). When trying to browse my shares with Dolphin (version 17.08.1), I only get an error that the connection timed out, so I tried it with smbclient.

When running smbclient (version 4.3.11-Ubuntu), I get the following output:

Code

smbclient -L 192.168.5.200
WARNING: The "syslog" option is deprecated
Enter user's password: 
protocol negotiation failed: NT_STATUS_INVALID_NETWORK_RESPONSE

However, when I set the maximum client protocol Version, I get a proper response:

Code

smbclient -m smb3 -L 192.168.5.200
WARNING: The "syslog" option is deprecated
Enter user's password: 

        Sharename       Type      Comment
        ---------       ----      -------
        Update          Disk      
        Videos          Disk      
        Music           Disk      
        TV Shows        Disk      
        Recordings      Disk      
        Downloads       Disk      
        Pictures        Disk      
        Emulators       Disk      
        Configfiles     Disk      
        Userdata        Disk      
        Screenshots     Disk      
        Logfiles        Disk      
        Backup          Disk      
        Picons          Disk      
        OMV             Disk      
        IPC$            IPC       IPC Service (LibreELEC)

        Server               Comment
        ---------            -------

        Workgroup            Master
        ---------            -------

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This works both with setting the maximum client protocol version to "smb2" and "smb3". kio-smb

I found a thread on LinuxQuestions.org, where the solution was to explicitly set the server protocol version to SMB3. I tried to set that in /storage/.config/samba.conf, which seemed to have no effect.

I noticed that in /etc/samba/smb.conf no protocol options are set, so where is this done? Is it possible to set the server protocol version explicitly without the min/max settings?

Regards

Zapp!

**chewitt** · September 16, 2017 at 10:02 PM Official Post

The current Samba version in Ubuntu 16.04 defaults to making NT1 (SMB1) connections even though it supports SMB2 and SMB3 - hence it works when you specify the client version from the command line. The default is scheduled to change to SMB3 in Samba 4.7 (due for release soon) and already does this in LE because we backported the change to Samba 4.6 for our codebase. You have two options:

a) Configure the system smb.conf in Ubuntu to have "client min protocol = smb2" and "client max protocol = smb3" so that smbclient connections are forced to use something higher than NT1 .. then you don't need to specify the protocol version manually.

b) Configure the Samba server in LE to allow SMB1 connections. This can be done in the LE settings GUI.

Zapp! · September 17, 2017 at 9:56 AM

Hi chewitt,

thank you very much for your response, I didn't know that smbclient in Ubuntu 16.04 doesn't switch to higher protocol versions automatically.

Adding

Code

client min protocol = smb2
client max protocol = smb3

to /etc/samba/smb.conf on my Ubuntu box fixes this. Browsing samba shares now works with smbclient and kio_smb.

Regards

Zapp!

Truncated · September 20, 2017 at 6:51 PM

Hey Zappa,

I experienced the same problem. I found the solution already, but still I can't access the shares via Nautilus or Dolphin. Does that work for you?

Zapp! · September 20, 2017 at 7:50 PM

Truncated

Yes, browsing with Dolphin works fine with the above mentioned fix. I don't use Nautilus, so I can't say anything about it.

Regards

Zapp!