Error message when you try to join a Windows Vista-based client computer to a Windows NT 4.0 domain: "Logon failure: unknown user name or bad password"

When you try to join a Windows Vista-based client computer to a Microsoft Windows NT 4.0 domain, you may receive the following error message:When this problem occurs, the following error may appear in the %windir%\Debug\Netsetup.log file:Note Error code 1326 and error code 0x52e are both mapped to the ERROR_LOGON_FAILURE error. The ERROR_LOGON_FAILURE error corresponds to the following error message:This problem also applies to Windows Server 2008.

To work around this problem, create the computer account in the Windows NT 4.0 domain before you join the Windows Vista-based client computer to the domain. Or, join the computer to a domain whose domain controller is running one of the following operating systems:

• Microsoft Windows 2000
• Windows Server 2003
• Windows Server 2003 R2
• Windows Server 2008

Note Microsoft does not support joining a Windows Vista-based client computer to a Microsoft Windows NT 4.0 domain. This scenario has not been tested.

For more information about the Microsoft support life cycle policy, visit the following Web site: