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


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@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@linux-2ak3:~> /sbin/mount.cifs --version
mount.cifs version: 6.5
hadrien@linux-2ak3:~> sudo mount -v -t cifs //nfsserv22/expsi test -o credentials=<path to credentials file>,vers=2.0
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@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.

Thanks in advance for your help,
Hadrien Grasland

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