[samba-jp:21255] net rpc right listに失敗します。

[tamu]

すごく初歩的なところでつまづいています。
パスワードを正しくうっているつもりなのですが、失敗します。

[root ＠ localhost source]# passwd
Changing password for user root.
New UNIX password:
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
[root ＠ localhost source]# net rpc rights list
Enter root's password:
Could not connect to server 127.0.0.1
The username or password was not correct.
Connection failed: NT_STATUS_LOGON_FAILURE
[root ＠ localhost source]# net rpc rights list
Enter root's password:
Could not connect to server 127.0.0.1
The username or password was not correct.
Connection failed: NT_STATUS_LOGON_FAILURE


/var/log/samba以下のどのファイルあたりを見ればよいでしょうか？

smb.confは以下のようです。

printing = bsd
workgroup = HOGE
server string = Samba Server Version %v
security = DOMAIN
passdb backend = tdbsam
realm=WIN2008HOST.HOGE.LOCAL
password server=WIN2008HOST
valid users=Administrator
encrypt passwords = Yes
wins server = 192.168.1.10
idmap backend = rid:HOGE10000-19999
idmap uid = 10000-19999
idmap gid = 10000-19999