Cannot mount file system that works with smbclient

[Reuben Thomas]

smbclient -U guest -N "//server/share location"

works fine, but:

$ sudo mount -t cifs -o guest "//server/share location" /mnt
mount error(22): Invalid argument
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

dmesg only shows the same error again:

[111147.812171] CIFS VFS: cifs_mount failed w/return code = -22

I have also tried using a user name, with the same success with smbclient, and the same error with mount.cifs.

This used to work under natty. I can find references to a problem with the 3.0 kernel, but I've tried it on an oneiric machine with the latest natty kernel, and get the exact same error.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: cifs-utils 2:5.0-1ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Tue Dec 13 19:27:05 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
SourcePackage: cifs-utils
UpgradeStatus: Upgraded to oneiric on 2011-10-07 (66 days ago)

[ScottPurcell (scott-texastwister)]

I'm seeing what may be the same bug (although my error message is different) in Ubuntu 12.04.

smbclient connects immediately:

sudo smbclient //pc1n7i01d03.us.dell.com/dttuatnas2 -A /etc/.smb_creds.txt

But mount.cifs fails (with "mount error(13): Permission denied"):

sudo mount.cifs //pc1n7i01d03.us.dell.com/dttuatnas2 /mnt/ -o credentials=/etc/.smb_creds.txt

my credentials file is formatted as follows (with the proper values, of course) and both smbclient and mount.cifs were instructed to use this file:

username=mynamehere
password=password
domain=MyDomain

I remember on a previous occasion (http://ubuntuforums.org/showthread.php?t=1420895) having resolved a similar problem by including a mount option "noserverino". I've tried that to no effect. I've also tried "sec=ntlmv2"

The syslog contains this message in response to each failed attempt:

CIFS VFS: cifs_mount failed w/return code = -13

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Steve Langasek (vorlon)]

fix for this is available in Debian unstable.