"krb_error 6 Client not found in Kerberos database" error

Hello.

HELP!

I am trying to setup Windows AD SSO, and I got this error when using kinit,

krb_error 6 Client not found in Kerberos database

what could be the cause for this error?

I found a note saying that this error  happens if it is a Windows2008 DC.

As for the environment I set up, the DC is Windows 2003, and BOE is in Windows2008 server.

BTW, manual AD works OK.

Thanks