Microsoft KB Archive/906524

= Error message when you try to connect to a remote share by using NTLM authentication on a Windows XP-based computer: &quot;Logon failure: unknown user name or bad password&quot; =

Article ID: 906524

Article Last Modified on 8/29/2007

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APPLIES TO

 Microsoft Windows XP Service Pack 2, when used with:  Microsoft Windows XP Professional

 Microsoft Windows XP Home Edition  Microsoft Windows XP Service Pack 1a, when used with:  Microsoft Windows XP Professional

 Microsoft Windows XP Home Edition</li></ul> </li> Microsoft Windows XP Service Pack 1, when used with:  Microsoft Windows XP Professional</li></ul>

 Microsoft Windows XP Home Edition</li></ul> </li> Microsoft Windows XP Professional</li> Microsoft Windows XP Home Edition</li></ul>

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SYMPTOMS
When you try to connect to a remote share by using NTLM authentication on a Microsoft Windows XP-based computer, you may receive the following error message:

Logon failure: unknown user name or bad password.

For example, you may experience this problem when you try to connect to a remote share by using the IP address as the server name.

Note This problem does not occur if you use Kerberos authentication.

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CAUSE
This problem occurs because Windows XP does not cache the user credential correctly. Therefore, you cannot be authenticated by the remote computer when you try to connect to the remote share.

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Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
To apply this hotfix, you must have Windows XP Service Pack 1 (SP1) or Windows XP Service Pack 2 (SP2) installed on the computer.

Restart requirement
You must restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Windows XP with Service Pack 2
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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Keywords: kberrmsg kbtshoot kbprb kbhotfixserver kbqfe KB906524

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