[Samba] Problem joining to AD domain

Hi all

I am running Fedora 9 , with Samba 3.2. I have problems joining my machine to
the domain.

[root@mymachine samba]# net join -U admin -S <PDC>
Enter admin's password:
Enter MYMACHINE$'s password:
Could not connect to server <PDC>
The username or password was not correct.
Connection failed: NT_STATUS_LOGON_FAILURE
Unable to join domain <MYDOM>
[root@mymachine samba]#

As you can see above, it asks for a 2nd password , which I dont know what it
is!! I used to join machines like this using samba-3.0.28 , with the same
config file , and it worked well. But here its asking for machine name's
password, which I am totally confused!
Any ideas please. .
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