Error message when you try to connect to a remote share by using NTLM authentication on a Windows XP-based computer: "Logon failure: unknown user name or bad password" (906524)


The information in this article 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
  • Microsoft Windows XP Service Pack 1, when used with:
    • Microsoft Windows XP Professional
    • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition

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.

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.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft Windows XP service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

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

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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 1
File nameFile versionFile sizeDateTimePlatform
Kerberos.dll5.1.2600.1735285,18424-Aug-200509:47x86

Windows XP with Service Pack 2
File nameFile versionFile sizeDateTimePlatform
Kerberos.dll5.1.2600.2745297,98424-Aug-200509:17x86

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Modification Type:MinorLast Reviewed:6/1/2006
Keywords:kberrmsg kbtshoot kbprb kbHotfixServer kbQFE KB906524 kbAudEndUser kbAudKnowledgeWorker
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