How I do force the lock screen to show REALM user or no user at all?

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http://serverfault.com – User successfully logs in as [email protected] . User is then mapped to [email protected] via altSecurityIdentities: Kerberos:[email protected] When the user locks the screen, the reentry login is [email protected], which the user does not have the (randomized) password for. It is possible for the user return to their session by backing out to the main login screen, which where EXAMPLE.COM is the default domain/realm, and logging in there. Is there a way to force [email protected] as the retry login on the lock screen or, failing that, cause the lock screen to go immediately to the main l (HowTos)