[Samba] w2k + xp clients password change freezes the client

[Josef Schauer]

Hi.

I've a problem changing the password of the domain user directly from
the windows client by using strg+alt+del.
If I try to change the password, the client freezes for several minutes
and after this amount of time
a popup appears with this error: The DOMAIN isn't available.

In the the samba logs I see this error:

can't connect to service "USERNAME"

this is the GLOBAL part of my smb.conf:

[global]
        workgroup = ISARLBERG
        passdb backend = tdbsam
        passwd program = /usr/bin/passwd %u
#       passwd chat = *Enter\snew\sUNIX\spassword:* %n\n
*Retype\snew\sUNIX\spassword:* %n\n .
        passwd chat = *New*Password* %n\n*Re-enter*new*password* %n\n
*Password*changed*
        username map = /etc/samba/smbusers
        unix password sync = Yes
        log level = 2
        time server = Yes
        printcap name = cups
        add user script = /usr/sbin/useradd -m %u
        delete user script = /usr/sbin/userdel -r %u
        add group script = /usr/sbin/groupadd %g
        delete group script = /usr/sbin/groupdel %g
        add user to group script = /usr/sbin/groupmod -A %u %g
        delete user from group script = /usr/sbin/groupmod -R %u %g
        add machine script = /usr/sbin/useradd -s /bin/false -d
/var/lib/nobody %u
        logon script = scripts\%U.bat
        logon path = \\%L\%U\profile
        logon drive = Z:
        logon home = \\%L\%U
        domain logons = Yes
        os level = 35
        preferred master = Yes
        domain master = Yes
        wins support = Yes
        idmap uid = 15000-20000
        idmap gid = 15000-20000
        printing = cups
        print command =
        lpq command = %p
        lprm command =

Thx Josef