[Samba] "wbinfo -n administrator" failed

Hi all,
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I have a strange situation, I hope someone can tell me what's wrong.
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I have a samba server 3.014a joined win2003 AD.
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When I run "wbinfo -n administrator", I am getting an error: "Could not
lookup name administrator"
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BUT
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If I first run "wbinfo -u" I get the list of users successfully and then
when I run "wbinfo -n administrator", the command now succeed.
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Any hint what went wrong?
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I don't see it with other domain controllers I have.
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Thanks,
Ephi
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