samba - Apr 1999 - smbpasswd fails when changing user passwords

Hello all,

I have yet another problem with my Samba 2.0.3 server:

When I try to change a users password either through SWAT or when logged in,
I get the following error message when trying to change the password:

---
machine 127.0.0.1 rejected the session setup. Error was: ERRSRV - ERRbadpw
(Bad password - name/password pair in a Tree Connect or Session Setup are
invalid.).
Failed to change password for xyz.
---

I can change the passwords for everybody when I'm the root user, but my
users are not able to change their passwords due to this error message.

Anybody got any ideas ?

Thanks

Marco.

   # Samba config file created using SWAT
   # from 153.95.169.103 (153.95.169.103)
   # Date: 1999/04/27 08:17:26

   # Global parameters
           workgroup = ARBEITSGRUPPE
           server string = Samba Server %v
           encrypt passwords = Yes
           null passwords = Yes
           log file = /usr/local/samba/var/log.%m
           max log size = 50
           socket options = TCP_NODELAY
           dns proxy = No
           remote announce = 153.95.169.255 153.95.160.255
           guest account = 
           hosts allow = localhost 153.95.

   [printers]
           comment = All Printers
           path = /usr/spool/samba
           print ok = Yes
           browseable = No

   [public]
           comment = Public Stuff
           path = /usr/samba-shares/public
           read only = No
           create mask = 0775
           directory mask = 0775
           guest ok = Yes

   [projekte]
           comment = Projektdaten
           path = /usr/samba-shares/projekte
           valid users = @samba_users
           read only = No
           create mask = 0775
           directory mask = 0775

   [root]
           path = /
           valid users = @root