Q:

I cannot figure out why `netdom join` is not working

I cannot get netdom join working on Windows Server 2008 R2.
netdom join bananas /domain:fruitland.local /userd:fruitland\Administrator /passwordd:*

Logon failure: unknown user name or bad password.

The command failed to complete successfully.

The local admin account I am using is has the same name and password as the domain admin account.  I've double checked DNS and passwords.  I can ping the DC.  The DC accepted netdom join from a Windows Server 2003 R2 machine earlier.  I've made sure that the older version of netdom for pre-Vista is not in the path.
However, when I go through the GUI System Properties > Computer Name and enter the same domain, username and password, it works fine.  The only difference I can see is that the user account details dialogue box is already set to use a domain, with the top level domain at the end.
So I tried:
netdom join bananas /domain:fruitland.local /userd:fruitland.local\Administrator /passwordd:*

...but that did not work either.  I get the same error.
I must be getting something wrong, as the GUI method works fine.

A:

While being logged into your local admin account, just type in
netdom join bananas /domain:fruitland.local

