On a Tru64 5.1A machine where ENHANCED security is not enabled, configure builds in SIA support anyway, and auth-sia does not check whether the security level is BASE or ENHANCED prior to checking password expiration. So, when logging in as root, the user is prompted for a new password, but in BASE security mode, the password change date is not recorded by passwd(1) (and remains 0), and the next login attempt fails in the same way.