changing password on NT

[tanel niine]

hello, 

i use samba-tng and smbd,nmbd on samba-main. samba is PDC. everything
works fine except changing password on nt worksation, the error message is
'unable to change password on this account [C00000BE], please consult
your system administrator', must i change some permissions somewhere?

and one other thing,
i followed the instrucion how to become a domain administrator but i can't
get it work

tnx
___
tanel niine