[Samba] winbind cannot run correctly

[maorui]

I modified /etc/nsswitch.conf, added winbind after passwd & group.
Also modified /etc/samba/smb.conf same as samba HOWTO collection's example.

The command "net rpc join -S DOMAIN -U Administrator" runned successfully,
and I could see my Linuxbox listed in ADS user&computer management console.

But when I started winbindd, some error messages appeared in
/var/log/message:

Nov 11 16:39:50 maorui 11 Oct 16:39:50 winbindd[2801]: [2003/11/11 16:39:50,
0] libads/kerberos.c:ads_kinit_password(133)
Nov 11 16:39:50 maorui 11 Oct 16:39:50 winbindd[2801]:
kerberos_kinit_password HOST/maorui at DOMAIN failed: Client not found in
Kerberos database

And I cannot use "wbinfo -u" & "wbinfo -g", always returned: Error looking
up domain users/groups.

What's wrong?