This article has been archived. It is offered "as is" and will no longer be updated.
Assume that on a Windows XP Service Pack 3 (SP3)-based computer, you have a user account that has a user name that contains Unicode characters. When you use this user account, the user name fails Extensible Authentication Protocol (EAP) authentication. Therefore, you cannot access the local network.
This problem occurs because of the EAPHost architecture in Windows XP SP3. When you try to authenticate, the EAPHost converts the EAP ID message to Unicode. However, the server tries to read the EAP ID message as ASCII. Therefore, if the user identity contains the ASCII characters 128 through 255, EAP authentication fails.
A supported hotfix is 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.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
To enable this hotfix, follow these steps:
Click Start, click Run, type regedit, and then click OK.
Check whether the problem is fixed. If the problem is fixed, you are finished with this article. If the problem is not fixed, you can contact support.
We would appreciate your feedback. To provide feedback or to report any issues with this solution, please leave a comment on the "Fix it for me" blog, or send us an e-mail message.
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 item in Control Panel.
Windows XP with Service Pack 3, x86-based versions
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about EAPHost architecture, visit the following Microsoft Web site: