Article ID: 159969 - View products that this article applies to.
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Although you have the AutoLogon feature of Windows NT enabled, when you start your Windows NT system you may receive the following error message instead of being automatically logged onto the computer:
When you click OK, you are prompted for a user name and password that is valid for the system.
The system could not log you on. Make sure your User name and domain are correct, then type your password again. Letters in passwords must be typed using the correct case. Make sure that Caps Lock is not accidentally on.
Your Windows NT system also has the registry entry DontDisplayLastUserName enabled.
To resolve this issue and use the AutoLogon feature, you will need to disable DontDisplayLastUserName using the following steps:
WARNING: Using Registry Editor incorrectly may cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.
The reason for this conflict is that the registry values are mutually exclusive. If you enable the DontDisplayLastUserName, you are effectively blanking out the user name during authentication. Auditing Logon and Logoff Success and Failure Events demonstrates that the user name is not available to the system:
11/11/96 2:41:02 PM Security Failure Audit Logon/Logoff 529 NT AUTHORITY\SYSTEM <Servername> Logon Failure: Reason: Unknown user name or bad password User Name: Domain: <Domain> Logon Type: 2 Logon Process: User32 Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0 Workstation Name: <Servername>
NOTE: The User Name field is blank. When the user name is not suppressed in the registry, any other circumstance to cause a failed logon attempt always displays the user name attempting to logon. This includes gibberish for either a DefaultUserName or DefaultPassword. In these cases the user name field is occupied.
For additional information, please see the following article in the Microsoft Knowledge Base:
TITLE : How to Enable Automatic Logon in Windows NT
Article ID: 159969 - Last Review: February 24, 2014 - Revision: 2.1