[linux-cifs-client] mount error 5 = Input/output error

[Robert S]

I have two mounted CIFS shares on my debian sarge box, to a Win XP Pro
server.  This usually functions well for a few days/hours then I get
input/output errors.  When I unmount the shares and try to reconnect I
get:

# mount -a -t cifs
mount error 5 = Input/output error
Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)
mount error 5 = Input/output error
Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)


I get this in my syslog

Aug  7 11:39:38 debian kernel:  CIFS VFS: Send error in SessSetup = -5
Aug  7 11:39:38 debian kernel:  CIFS VFS: cifs_mount failed w/return code = -5
Aug  7 11:39:38 debian kernel:  CIFS VFS: Send error in SessSetup = -5
Aug  7 11:39:39 debian kernel:  CIFS VFS: cifs_mount failed w/return code = -5

The relevant lines in my /etc/fstab look like this:
//server/doc    /mnt/server     cifs
credentials=/root/.smbmount,username=XXXX,uid=XXXX,file_mode=0755,dir_mode=0755
  0       0

Is somebody able to give me some idea as to where to start with this problem?