I should clarify. The ugly message is when you use a logon container for allowing only users in that container to logon. If someone who is not in that container tries to logon, you get the Fatal message.
I'd rather have something much simpler, stating 'You do not have authority to log on to the system.' Or something similar. The Fatal part of the message is where the users freak and we get panic calls saying the system is down or the like.
Thanks