Seeing that you post a question about a server, you are
most likely familiar with the standard user question: "My
PC does not work anymore. Fix it!".
Your question is much the same: You're telling us that you
have logon problems but you are not telling us anything
about what happened to your server during the past few
days. You must have been able to log on at some stage,
and at some state you could no longer log on. Now please
put on your analytic administrator's hat and tell us in as
much detail as possible what happened to your machine
during these two points in time. Without this information
I would have to use my magic wand to help you. Unfortunately
I do not have it with me right now - I'm having it tuned up.
