domain controler

Hi
imam samba 2.2.1a .Iskam Win XP mashina da se logva kum domain-a.
Ta zna4i kazvam mu na XP-to da e member of domain : XXX.
To mi iska username i passowrd.Napravil sum account na mashinata i na userite v Linux mashinata .
Pisha si username i password i mi kazva "Access is denied";
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v smb.conf imam :
domain logons = yes
encrypt passwors = yes
....
...
Idei ?