Looks like I've been mislead by the man page of mount.cifs and linux/fs/cifs/connect.c which state:
man mount.cifs: vers= SMB protocol version. Allowed values are: ยท 1.0 - The classic CIFS/SMBv1 protocol. This is the default. 4.13 kernel code: pr_warn("No dialect specified on mount. Default has changed to " "a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS " "(SMB1). To use the less secure SMB1 dialect to access " "old servers which do not support SMB3 (or SMB2.1) specify vers=1.0" " on mount.\n"); So looks like I need to explicitly apply the version number to mount.cifs argument to have consistent results. More over sec=ntlm is needed in smb.conf and mount.cifs cmdline. Updating the description. ** Description changed: On a Xenial installation after upgrading to the HWE 4.13.0-32-generic kernel it is not possible to use mount.cifs with -o vers=x.y different than 1.0. Steps to reproduce: - 1. Setup a local Samba share. + 1. Setup a local Samba share with ntlm auth = yes. 2. Run: - mount.cifs -o user=<myuser>,sec=ntlm //localhost/theshare/ /mnt/theshare - (please note that not specifying the vers= option results in using protocol SMB2.1 which also results in the error). + mount.cifs -o user=<myuser>,sec=ntlm,vers=2.0 //localhost/theshare/ /mnt/theshare 3. This may be repeated for the following versions: 2.0, 2.1, 3.0. Expected result: The share gets mounted at /mnt/theshare. Actual result: The share is not mounted, this gets printed in the console (and in dmesg): [ 232.439162] CIFS VFS: ioctl error in smb2_get_dfs_refer rc=-2 ** Description changed: On a Xenial installation after upgrading to the HWE 4.13.0-32-generic kernel it is not possible to use mount.cifs with -o vers=x.y different than 1.0. Steps to reproduce: 1. Setup a local Samba share with ntlm auth = yes. 2. Run: mount.cifs -o user=<myuser>,sec=ntlm,vers=2.0 //localhost/theshare/ /mnt/theshare 3. This may be repeated for the following versions: 2.0, 2.1, 3.0. Expected result: The share gets mounted at /mnt/theshare. Actual result: - The share is not mounted, this gets printed in the console (and in dmesg): - [ 232.439162] CIFS VFS: ioctl error in smb2_get_dfs_refer rc=-2 + The share is not mounted, this gets printed in the console: + mount error(22): Invalid argument + Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) + + and in dmesg: + [ 61.935687] CIFS VFS: Unable to select appropriate authentication method! + [ 61.935689] CIFS VFS: Send error in SessSetup = -22 + [ 61.935744] CIFS VFS: cifs_mount failed w/return code = -22 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1746482 Title: mount.cifs stopped working with protocol version != 1.0 Status in linux package in Ubuntu: Incomplete Bug description: On a Xenial installation after upgrading to the HWE 4.13.0-32-generic kernel it is not possible to use mount.cifs with -o vers=x.y different than 1.0. Steps to reproduce: 1. Setup a local Samba share with ntlm auth = yes. 2. Run: mount.cifs -o user=<myuser>,sec=ntlm,vers=2.0 //localhost/theshare/ /mnt/theshare 3. This may be repeated for the following versions: 2.0, 2.1, 3.0. Expected result: The share gets mounted at /mnt/theshare. Actual result: The share is not mounted, this gets printed in the console: mount error(22): Invalid argument Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and in dmesg: [ 61.935687] CIFS VFS: Unable to select appropriate authentication method! [ 61.935689] CIFS VFS: Send error in SessSetup = -22 [ 61.935744] CIFS VFS: cifs_mount failed w/return code = -22 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1746482/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp