Win2k login problem

[ben]

Hi there,
I'm trying to connect a Win2k client to a Samba TNG 2.5 server (compiled
with '--with-ldap'), running on the latest Debian version, in order to
export roaming profiles to the client. I have followed the instructions
given by the Samba TNG - LDAP  Howto (written by Ignacio Coupeau) to set
up the ldap database.
Presently:
The Win2k can see the server in the network neighbourhood and access any
public share.
A connection to server with 'smbclient' works fine.
The 'createuser' command works as well and I created a trust account for
my Win2k client and a few user accounts.
But when I authenticate from the client to enter the domain, I get the
following error:
    "The account used is a computer account. Use your global account or
local user account to access this server".
Is it a known problem ?
What kind of account must I create on the server to authenticate the
client ?

Thanks a lot

Benoit Geslot
--
Elève ingénieur à l'Ecole Supérieure de Physique et de Chimie
Industrielles
benoit.geslot at bde.espci.fr
--

PS: although it seems to be a LDAP problem, this is my smb.conf:

[global]
 ldap suffix = "my_suffix"
 ldap bind as = "cn=ldapadmin, my_suffix"
 ldap passwd file = /etc/samba/private/ldappasswd
 ldap server = localhost

 workgroup = my_domain
 netbios name = my_name

 client code page = 437
 server string = %h server (Samba %v)

 wins support = yes
 local master = yes
 os level = 255
 domain logons = yes
 domain master = yes

 logfile = /var/log/samba/%m
 max log size = 1000
 loglevel = 5
 lock directory = /var/lock/samba
 syslog = 0

 interfaces = xxx.xx.xx.xxx
allow hosts = xxx.xx.xx.xxx xxx.xx.xx.xxx xxx.xx.xx.xxx
 security = user
 invalid users = root
 null passwords = yes
 encrypt passwords = yes

[homes]
 guest ok = no
 read only = no
 browseable = no
 create mask = 0750
 directory mask = 700

[netlogon]
 path = /home/interne/netlogon
 writeable = no
 browseable = no
 locking = no
 guest ok = no

[profiles]
 path = /home/interne/profiles
 browseable = yes
 guest ok = yes
 writeable = no
 create mode = 0777

[tmp]
 comment = Espace disque Temporaire
 path = /home/tmp
 public = yes
 writeable = yes
 printable = no
 read only = no

[printers]
 browseable = no
 path = /tmp
 printable = yes
 public = no
 writable = no
 create mode = 0700