Probleme mot de passe avec samba

bonjour,

je suis en redhat 6.2 avec samba, et j'ai un probleme avec un user !

quand je veux changer son mot de passe, samba refuse, alors j'ai essayé de supprimer le user et de le ré importer dans samba à partir du user linux, mais toujours le même probleme. Le probleme c'est que ce user à un mot de passe vide et n'accepte aucun autre mot de passe.

ça ne le fait que pour cet utilisateur !!

quelqu'un a t il eu ce probleme ?

voici mon smb.conf

#======================= Global Settings =====================================
[global]

# workgroup = NT-Domain-Name or Workgroup-Name
netbios name = serveur
workgroup = salins
guest account = nobody
keep alive = 30
os level = 64
domain master = yes
preferred master = yes
domain logons = yes
security = user
local master = yes
pam password change = yes
password server = serveur

# server string is the equivalent of the NT Description field
server string = Serveur LA BELINE (SALINS) [samba %v]
time server = yes
announce as = NT
announce version = 4.2
lm announce = true
logon script = %U.bat
logfile = /var/log/samba.log
encrypt passwords = yes
printing = bsd
printcap name = /etc/printcap
load printers = yes
socket options = TCP_NODELAY
map to guest = never
interfaces = 55.85.203.200/255.255.255.0
wins support = no
unix password sync = no
password level = 0
null passwords = no
dead time = 0
debug level = 0

# Rajouter

# name resolve order = wins lmhosts bcast
# username map = /etc/smbusers
# smb passwd file = /etc/smbpasswd
# passwd program = /usr/bin/passwd %u
logon home = \\home\%U
logon path = \\%N\%U\profile

#============================ Share Definitions ==============================
[homes]
comment = Repertoire de Travail
path = %H
writeable = yes
valid users = %S
create mode = 0600
directory mode = 0700
locking = no
available = yes
browseable = no
public = no
writable = no
only user = no

# Un-comment the following and create the netlogon directory for Domain Log

[netlogon]
path = /home/netlogon
writable = yes
public = yes
available = yes

[cdrom]
comment = CDROM du serveur
path = /mnt/cdrom
browsable = yes
read only = yes
;root preexec = /bin/mount /mnt/cdrom
;root postexec = /bin/umount /mnt/cdrom

[salins]
comment = Repertoire commun La Beline
path = /home/samba
writable = yes
valid users = @SALINS,@MEDICAL
locking = yes
create mode = 0660
directory mode = 0770
available = yes
browseable = no
public = no
guest only = no
only user = no

[medical]
comment = Repertoire commun médical
path = /home/medical
writable = yes
valid users = @MEDICAL, hiron
locking = yes
create mode = 0660
directory mode = 0770
available = yes
browseable = no
public = no
guest only = no
only user = no

[administratif]
comment = Repertoire commun administratif
path = /home/administratif
writable = yes
valid users = @SALINS
locking = yes
create mode = 0660
directory mode = 0770
available = yes
browseable = no
public = no
guest only = no
only user = no

[direction]
comment = Repertoire commun direction
path = /home/direction
writable = yes
valid users = @DIRECTION
locking = yes
create mode = 0660
directory mode = 0770
available = yes
browseable = no
public = no
guest only = no
only user = no

[secrmedical]
comment = Repertoire commun sartoris monnet
path = /home/secrmedical
writable = yes
valid users = @MEDICAL
locking = yes
create mode = 0660
directory mode = 0770
available = yes
browseable = no
public = no
guest only = no
only user = no

[partagmed]
comment = Repertoire commun sartoris monnet grillet mathieu saillard garcia morin colin cuynet hiron
path = /home/partagmed
writable = yes
valid users = @MEDICAL, hiron, sartoris
locking = yes
create mode = 0660
directory mode = 0770
available = yes
browseable = no
public = no
guest only = no
only user = no

[secretariat]
comment = Repertoire commun sartoris monnet hiron
path = /home/secretariat
writable = yes
valid users = hiron, sartoris, monnet
locking = yes
create mode = 0660
directory mode = 0770
available = yes
browseable = no
public = no
guest only = no
only user = no

[norton]
comment = norton
path = /home/ftp/norton
writable = yes
valid users = ugecam
locking = no
create mode = 0660
directory mode = 0770

[openldf]
comment = OpenLDF
path = /home/openldf
valid users = @DIRECTION
locking = no
create mode = 0660
directory mode = 0770
writable = yes

[ftp]
comment = Repertoire pour transfert de fichiers
path = /home/ftp
writable = yes
locking = no
create mode = 0660
directory mode = 0770

[printers]
comment = All Printers
path = /var/spool/samba
browseable = no
# Set public = yes to allow user 'guest account' to print
guest ok = no
writable = no
printable = yes

merci d'avance.