samba - Sep 2003 - Samba 2.x servers can't join Samba 3.0 domain

Hi
I updating my PDC from Samba-TNG to Samba 3.0 RC4 with LDAP. 
The Windows clients and servers work fine but the Samba 2.x servers are
unable to join the domain.

Samba 2.x server:
[global]
     netbios name = smbold
     workgroup = MYDOMAIN
     security = domain
     encrypt passwords = yes
     password server = myserver

I create the machine account on my Samba 3.0 PDC
     ./smbpasswd -a -m smbold$

Now I try to join the domain on my Samba 2.x server
     ./smbpasswd -j mydomain -r myserver -U administrator%passwd
     Joined domain mydomain

Joining the domain seems to be OK on my PDC.
log.smbd on the Samba 3.0 PDC:
      [2003/09/15 09:10:21, 2] lib/smbldap.c:smbldap_search_suffix(1068)
       smbldap_search_suffix: searching
for:[(&(sambaSID=S-1-5-21-4032476932-67515532-
       795018592-2774)(objectclass=sambaSamAccount))]
      [2003/09/15 09:10:21, 2] passdb/pdb_ldap.c:init_sam_from_ldap(460)
       Entry found for user: smbold$
      [2003/09/15 09:10:21, 2] passdb/pdb_ldap.c:init_ldap_from_sam(782)
       Setting entry for user: smbold$
      [2003/09/15 09:10:21, 2]
passdb/pdb_ldap.c:ldapsam_update_sam_account(1421)
       successfully modified uid = smbold$ in the LDAP database
      [2003/09/15 09:10:21, 2] lib/smbldap.c:smbldap_search_suffix(1068)
       smbldap_search_suffix: searching
for:[(&(sambaSID=S-1-5-21-4032476932-67515532-
       795018592-2774)(objectclass=sambaSamAccount))]
      [2003/09/15 09:10:21, 2] passdb/pdb_ldap.c:init_sam_from_ldap(460)
       Entry found for user: smbold$

I get an error if I try to get access to my server.
log.smbd on the Samba 2.x server:
      [2003/09/15 09:14:54, 0] rpc_client/cli_netlogon.c:cli_net_auth2(157)
       cli_net_auth2: Error NT_STATUS_ACCESS_DENIED
      [2003/09/15 09:14:54, 0] rpc_client/cli_login.c:cli_nt_setup_creds(72)
       cli_nt_setup_creds: auth2 challenge failed
      [2003/09/15 09:14:54, 0]
smbd/password.c:connect_to_domain_password_server(1368)
       connect_to_domain_password_server: unable to setup the PDC
credentials to machine
       MYSERVER. Error was : NT_STATUS_OK.
      [2003/09/15 09:14:54, 0] smbd/password.c:domain_client_validate(1601)
       domain_client_validate: Domain password server not available.
      [2003/09/15 09:14:54, 0] passdb/pdb_smbpasswd.c:pdb_getsampwnam(1369)
       unable to open passdb database.
      [2003/09/15 09:14:54, 1] smbd/password.c:pass_check_smb(545)
       Couldn't find user 'dummy' in passdb.

What's going wrong?

Thanks,

Hubertus Bartkowski