[Samba] vampire, cannot create workstation account

[Danilo Moretto]

hi,

im trying to migrate from a w 2003 to samba 3, the ones comes with 
debian etch. im following the info from the samba.org,

i set the smb.conf as ROLE BDC setting:

security = user
domain logon =yes
preferred master=no

like is described in the documentation.

i can do, #net rpc join -W domain -U Administrator
but when trying: net rpc vampire -S W2k3server -W domain -U Administrator

this error show: cannot create workstation account.

im forgetting to make some change??
PLEASE HELP
Danilo Moretto