SBS suddenly won't login with correct credentials, or allow a shut down?

Have been working on this SBS all day with the appropriate credentials and no problems.  Suddenly, it won't allow a login with the same credentials.  It says I have typed the wrong password or username.  No, I have triple checked and everything is as exactly as it was just moments ago when it did work.  This is a new client also.  When he saw the trouble I was having, he piped up and said that he had the same thing happen to him on his workstation occasionally.  He would have to restart it a few times and finally it would allow him to login again.  I haven't had the chance to scan his workstation yet, as I am trying to get a firewall installed.  However, I cannot imagine why the server would block a login suddenly?  Add to that, it would not allow me to shut down via the login screen either!  What should I try?  I have no idea.
BonnyelizAsked:
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purplepomegraniteConnect With a Mentor Commented:
Ok, I did presume that, but wanted to double-check!

If your client says that it occasionally happens to him, does this mean that after a time he can log in again?  If that is the case, it would be worth waiting for a while to see if you can log in later.  If not, what is done to resolve the problem on other occasions?

If you are completely locked out, you are going to have to use a password recovery tool (for example SamInside) to try to recover the password.  This would involve powering down the server though and accessing the hard-drives from another OS (e.g. BartPE).
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purplepomegraniteCommented:
You cannot shut down a server from the log-in screen - this prevents anyone other than an administrator from initiating a shut-down.

Is it the Administrator account with which you are trying to log in?
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BonnyelizAuthor Commented:
No, it is not the administrator account, but an account that was created with admin privileges.  The user does not have any knowledge of an administrator password, and assumes that this logon is the main admin account for the server.

I found it peculiar that the client advised his own workstation had been doing the same thing.  He mentioned that his mapped drives and network printer would show as "unavailable", yet he could never get them to delete after creating a new connection that did work.
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BonnyelizAuthor Commented:
I should just reset the admin password, I know, but that still doesn't explain why the credentials suddenly quit working within moments of working just fine and no changes.
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purplepomegraniteCommented:
So can you not log in at all with administrative privileges right now?

You need to get in as administrator somehow to check the account and event log - there should be clues as to what the problem is somewhere, but you do need to be logged in!  And while you are in, definitely reset the admin password.
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BonnyelizAuthor Commented:
So what's the easiest/best way to reset an unknown password for the admin account on an SBS03?
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purplepomegraniteCommented:
The easiest way is when logged in with an administrative account, to locate the Administrator account is AD Users and Computers, then right-click and Reset Password.

However, you need to be logged in as an administrator.  Can you do this at all?
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BonnyelizAuthor Commented:
No, or I would simply reset the password :)
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BonnyelizAuthor Commented:
It seems that if he restarts the computer several times, eventually it lets him back in.  I only had this happen with the server at the end of the day, so I only tried for about 20 minutes and 2 reboots.  The first reboot was from the correct and successful login, the second unfortunately a hard power down.

I'll return in the morning with the status!
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BonnyelizAuthor Commented:
Poblem resolved.  I was able to log in correctly the following day and just reset the admin pw for safety.  Awarding points as your responses were quick and would have assisted greatly had a difficult password reset been needed.  Thanks.
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