[Samba] Share mounts in SMBv1 mode, but fails weirdly in SMBv2 mode

Hadrien Grasland grasland at lal.in2p3.fr
Fri Oct 13 12:16:02 UTC 2017

Le 13/10/2017 à 14:00, Hadrien Grasland via samba a écrit :
> Le 13/10/2017 à 01:46, Jeremy Allison via samba a écrit :
>> On Thu, Oct 12, 2017 at 03:58:58PM +0200, Hadrien Grasland via samba 
>> wrote:
>>> Hi,
>>> We're slowly deprecating SMBv1 support at work, so I'm trying to
>>> mount our Samba network shares using SMBv2.0. This should in
>>> principle be supported by the server, and seems works well enough
>>> for the Windows clients. But it fails for me with some errors which
>>> I do not understand.
>>> Can you help me figure out what's going on? Here's my system
>>> configuration and a quick summary of what I have so far:
>>> hadrien at linux-2ak3:~> uname -a
>>> Linux linux-2ak3 4.13.5-1-default #1 SMP PREEMPT Thu Oct 5 18:28:26
>>> UTC 2017 (3fd9659) x86_64 x86_64 x86_64 GNU/Linux
>>> hadrien at linux-2ak3:~> /sbin/mount.cifs --version
>>> mount.cifs version: 6.5
>>> hadrien at linux-2ak3:~> sudo mount -v -t cifs //nfsserv22/expsi test
>>> -o credentials=<path to credentials file>,vers=2.0
>>> domain=LAL
>>> mount.cifs kernel mount options: 
>>> ip=,unc=\\nfsserv22\expsi,vers=2.0,user=grasland,,domain=LAL,pass=********
>>> mount error(95): Operation not supported
>>> Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
>>> hadrien at linux-2ak3:~> dmesg | tail
>>> [...]
>>> [13424.783242] CIFS VFS: ioctl error in smb2_get_dfs_refer rc=-2
>>> [13424.789504] CIFS VFS: cifs_read_super: get root inode failed
>>> Replacing "vers=2.0" with "vers=1.0" in the mount command line makes
>>> this work, so I'm quite confident that my general configuration is
>>> correct and the problem is somehow specific to the SMBv2 protocol.
>>> However, I'm a Samba newbie and would welcome any tips on how to
>>> extract more information from this machine/server in order to figure
>>> out why SMBv2 specifically is failing.
>> Can you get a wireshark trace on port 445 between client and
>> server ? That would help.
> There you go. I attached it to the e-mail, not sure if that's the 
> proper way to send (small) files around on this list, if not please 
> tell me :)
Okay, it seems the file did not get through, answering my question I 
guess. Here's an online upload: https://uploadfiles.io/8liej .

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