error joining domain

[Nay Myo Win]

I m doing like it said on
https://help.ubuntu.com/community/SettingUpSambaPDC.

but not ok to join domain from windows client.

on xp, whenever i joined, i got user name and pwd as usual in joining
windows PDC, but when i typed in username and pwd.

I got " error attempting to join domain. access denied"

what do i do?
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