samba mount failed with "CIFS VFS: cifs_mount failed w/return code = -6" and "is not a valid block device"

Question

Environment:

server: Windows
client: RHEL 6.7 (samba-common-3.6.23-20.el6.x86_64) or Debian Wheezy (samba-common-bin 2:3.6.6-6+deb7u7)

Client's /etc/fstab:

//10.0.0.10/share/ /media/smb    cifs    _netdev,user,uid=1000,forceuid,gid=1000,forcegid,noperm,username=XXXX,password=XXXX,domain=aa.bb.cc

Mounting:

$ sudo mount /media/smb/
mount: //10.0.0.10/share/ is not a valid block device
$ dmesg | tail
CIFS VFS: cifs_mount failed w/return code = -6

Amit Vujic · Accepted Answer · 2017-10-23 16:28:44Z

3

Possible issue is CIFS/SMB version

//192.168.1.1/MyShare/    /mnt/cifs  cifs vers=2.1,username=user1,password=passwd1   0       0

answered Oct 23, 2017 at 16:28

Amit Vujic

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cifs version was the problem for me. Moving from 1.0 to 2.1 (like you said) solved.
– Niki Romagnoli
Commented Nov 3, 2020 at 11:03

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parallyze · Accepted Answer · 2017-10-23 16:38:10Z

1

Might be related to SMBv1/CIFS removal in Windows 10 / Windows Server v1709 (RS3):

answered Oct 23, 2017 at 16:38

parallyze

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fboaventura · Accepted Answer · 2019-02-08 22:39:04Z

1

You have to add cifs-utils to be able to mount CIFS shares:

Red Hat/CentOS related:

$ sudo yum install cifs-utils

Debian/Ubuntu related:

$ sudo apt install cifs-utils

fboaventura

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answered Apr 14, 2016 at 12:16

user46935

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3 Answers 3