samba - Aug 2004 - use ads join command with general user account on AD

Hello,
I'm a little bit confused. Please can I have you advice.

I installed Samba 3.0.6 on RedHat 9.0 and tried to join in to
Active Directory.

At first, I made a computer account on AD and gave a permission
of using this computer account to an user account on AD.
And then, I executed "kinit user@MY-DOMAIN" command, put a
correct password and did "use ads join" command. But it failed.

With NTLM authentication and "use rpc join" command, this kind
of approach was succeeded.

I would like to know whether or not "use ads join" command
runs successfully with only administrator account on AD, and
if so I would like to know why... because in order to join normal
Windows PC or member server to AD, just an user account which
has a permission of using this computer account on AD is enough.

Best regards,

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