samba - Sep 2002 - "incorrect password length" when trying to domain-logon from XP to 2.2.3a

I'm trying to set up Samba 2.2.3a as a logon server for my Win2k/XP network.
But when I try to join the domain with a XP Professional client (the
SignOrSeal-Patch is installed, the other option in the management console is
also set up) I get the error message "Login failed: unkown user name or
wrong password" (translated from German) ... in the server's log there
are
the following lines connected with my join attempt:

[2002/09/27 17:43:38, 0] smbd/service.c:make_connection(381)
  helge logged in as admin user (root privileges)
[2002/09/27 17:43:38, 2] rpc_parse/parse_samr.c:samr_io_userinfo_ctr(6284)
  samr_io_userinfo_ctr: unknown switch level 0x1a
[2002/09/27 17:43:38, 0] rpc_server/srv_samr.c:api_samr_set_userinfo(670)
  api_samr_set_userinfo: Unable to unmarshall SAMR_Q_SET_USERINFO.
[2002/09/27 17:43:38, 0] libsmb/smbencrypt.c:decode_pw_buffer(263)
  decode_pw_buffer: incorrect password length (-677165665).
[2002/09/27 17:43:39, 0] smbd/service.c:make_connection(381)
  helge logged in as admin user (root privileges)
[2002/09/27 17:43:39, 2] smbd/server.c:exit_server(458)
  Closing connections

The XP-client's name is "atlantixpc" (192.168.0.86), the server
has the ip
192.168.0.90 - I attach several config files that may help you to help me
(the directories referenced to do all exist):

--- START --- /etc/samba/smb.conf ---
[global]
        workgroup = MITTELERDE
        netbios name = SAURON
        netbios aliases = server
        server string = MITTELERDE-Server (Samba %v PDC)
        interfaces = 192.168.0.90/24
        encrypt passwords = Yes
        smb passwd file = /etc/samba/smbpasswd
        passwd program = /usr/bin/passwd %u
        passwd chat = *new*password* %n\n                     *new*password*
%n\n *Password*changed*
        username map = /etc/samba/smbusers
        username level = 10
        unix password sync = Yes
        log level = 2
        log file = /var/log/samba/mittelerde.%m
        time server = Yes
        deadtime = 15
        socket options = TCP_NODELAY IPTOS_LOWDELAY SO_KEEPALIVE
        domain admin group = helge root
        logon script = timeserv.bat
        logon path = \\%N\profiles\%U
        domain logons = Yes
        os level = 255
        preferred master = True
        domain master = True
        wins support = Yes
        lock dir = /var/lib/samba
        pid dir = /var/run/samba
        socket address = 192.168.0.90
        admin users = helge root
        create mask = 0640
        directory mask = 0750

[netlogon]
        comment = Spezielle Net-Logon Share
        path = /daten/samba/netlogon   # debug: directory exists
        browseable = No

[profiles]
        comment = Roaming Profiles Directory
        path = /daten/samba/profiles   # debug: directory exists
        read only = No
        create mask = 0600
        directory mask = 0700
--- END --- /etc/samba/smb.conf ---

--- START --- /etc/samba/lmhosts ---
127.0.0.1       localhost
192.168.0.90    sauron.mittelerde       sauron
192.168.0.86    AtlantixPC
--- END --- /etc/samba/lmhosts ---

--- START --- /etc/samba/smbpasswd ---
root:0:EFA34B9B319466F0D480EA9533C500D4:85BF0859F208C17BB0132D6E3E70D44B:[UX
         ]:LCT-3D946076:
helge:500:EBD223B61F8C259CAAD3B435B51404EE:98BB35737013AAFF03181D0FE9FDA09E:
[UX         ]:LCT-3D94686E:
sauron$:588:EADCA5F1290B3E63AAD3B435B51404EE:FDCA9094406ECAF37299CDDE583285E
B:[W          ]:LCT-3D946215:
atlantixpc$:580:504A5C67888BCFDAF423D1FCE1D1C272:464A7881DF41CFFA0CC13A0BAD3
1F697:[W          ]:LCT-3D9475EB:
--- END --- /etc/samba/smbpasswd ---

--- START --- /etc/samba/smbusers ---
root = Administrator admin
helge = "Helge Jung"
--- END --- /etc/samba/smbusers ---

--- START --- /etc/passwd --- (parts only)
helge:x:500:100:Helge Jung:/home/helge:/bin/bash
sauron$:x:588:503::/home/sauron$:/bin/false
atlantixpc$:x:580:503::/home/atlantixpc$:/bin/false
--- END --- /etc/passwd ---

Hopefully you can help me,

Helge.