Microsoft KB Archive/906911

= Error message when you try to log on to Windows Server 2003 or to Windows 2000 by using the IP address as the user name: “The specified target is unknown or unreachable” =

Article ID: 906911

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
 * Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Datacenter Server

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SYMPTOMS
When you try to log on to Microsoft Windows Server 2003 or to Microsoft Windows 2000 Server by using an IP address as the user name, you receive an error message that is similar to the following:

The system cannot log you on due to the following error:

The specified target is unknown or unreachable

Note You may also experience this problem when you use a thin client program that uses the IP address as the user name to automatically log on to Windows.



CAUSE
This issue occurs because the Kerberos client that is included in Windows Server 2003 and in Windows 2000 does not allow interactive logon when you use an IP address as the user name.



WORKAROUND
To work around this issue, log on to the computer by using the user principal name (UPN) logon format. For example, use the following UPN format:

@

Note  can be your IP address.

Additional query words: number numbers period

Keywords: kbtshoot kbprb KB906911

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