[Samba] Debugging the log

[Gururajan Ramachandran]

Samba version is:
Version 3.0.20b-3.1-SUSE

Current PDC is active directory Windows 2000 Server.

I replaced the actual ip address with IPADDRESS and the actual broadcast 
address
with BROADCASTADDRESS.

net rpc join -S DOMAINPC-dc -U administrator
Password:
Joined domain DOMAINNAME.

net rpc vampire -d 3 -S DOMAINPC -U administrator

[2006/01/12 09:19:47, 3] param/loadparm.c:lp_load(4202)
   lp_load: refreshing parameters
[2006/01/12 09:19:47, 3] param/loadparm.c:init_globals(1388)
   Initialising global parameters
[2006/01/12 09:19:47, 3] param/params.c:pm_process(574)
   params.c:pm_process() - Processing configuration file 
"/etc/samba/smb.conf"
[2006/01/12 09:19:47, 3] param/loadparm.c:do_section(3664)
   Processing section "[global]"
[2006/01/12 09:19:47, 3] param/params.c:pm_process(574)
   params.c:pm_process() - Processing configuration file 
"/etc/samba/dhcp.conf"
[2006/01/12 09:19:47, 2] lib/interface.c:add_interface(81)
   added interface ip=IPADDRRESS bcast=BROADCASTADDRESS nmask=255.255.255.0
[2006/01/12 09:19:47, 3] libsmb/cliconnect.c:cli_start_connection(1407)
   Connecting to host=DOMAINPC
[2006/01/12 09:19:47, 3] lib/util_sock.c:open_socket_out(867)
   Connecting to IPADDRESS at port 445
Fetching DOMAIN database
Failed to fetch domain database: NT_STATUS_NOT_SUPPORTED
Perhaps DOMAINNAME is a Windows 2000 native mode domain?
[2006/01/12 09:19:47, 1] utils/net_rpc.c:run_rpc_command(142)
   rpc command function failed! (NT_STATUS_NOT_SUPPORTED)
[2006/01/12 09:19:47, 2] utils/net.c:main(873)
   return code = 1

I checked RPC service on existing PDC and it is running.
I completely turned off firewall on the Linux machine so not a firewall 
problem.
As you can see, it joined domain fine.
How can I debug this problem to resolve it?

Thanks for any advice/help you can offer.