At this screen during install, it asks for

User name:

I put CN=admin,o=(his context), and this then fades the Context box, and then I enter I know to be the password in, but get "The authentication attempt failed: Confidentiality is required for this operation". I also get this if I leave the default context it opened up the screen in. ( [root] Treename )

If I put in just "admin" for the name, the known password, and the correct context, I get "The user name admin is invalid"

What am I doing wrong?