smbclient(1) works, but mount_smbfs(8) does not

Matthias Apitz guru at
Wed Oct 25 09:23:49 UTC 2017


At work I have a FreeBSD 12-CURRENT in a VirtualBox on top of Windows
and I was used to use mount_smbfs(8) to mount the Windows onto my
FreeBSD without any problem. From one day to the other it stopped
working and gives Authentication error. I have not changed any
credentials or the like.

I'm happy to see, that smbclient(1) works still fine, using the same

$ cat .smbpw 
username = apitzm
password = SantaClXXXXXXXXXXXX
domain   = company
$ smbclient //APITZM-LTOH/apitzm -A .smbpw -I
Domain=[company] OS=[Windows 7 Professional 7601 Service Pack 1] Server=[Windows 7 Professional 6.1]
smb: \>

es geht nicht mit:

# mount_smbfs -I -u guru -g wheel //apitzm at APITZM-LTOH/apitzm /win
mount_smbfs: unable to open connection: syserr = Authentication error

I have no access to the servers behind my workstation.
In the truss of mount_smbfs the failing looks like this:

openat(AT_FDCWD,"/dev/nsmb",O_RDWR,00)           = 3 (0x3)
ioctl(3,SMBIOC_LOOKUP,0xffffdc38)                ERR#80 'Authentication
write(2,"mount_smbfs: ",13)                      = 13 (0xd)
write(2,"unable to open connection",25)          = 25 (0x19)

I have no access to the servers behind my workstation. Any idea what
could be the reason. Maybe I could compile a debug version of
mount_smbfs to see what is in the struct of the ioctl(2) call...


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