[Samba] error setting trust account password

[Dave]

Hello,
    I've set up a FreeBSD pdc with a lot of help and now i'm trying to add a 
member server to the domain. This member server isn't a bdc, it's just a 
member server that coincidentally does printing. I'm following chapter 2 of 
the official howto and am issueing the command:

net rpc join -Uroot%password

error setting trust account password, can not join domain.

    I've got winbind running on the pdc and currently i don't have a 
firewall on it either. Any suggestions?
Thanks.
Dave.