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
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.
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: Note
The "Hotfix download available" form displays the languages for
which the hotfix is available. If you do not see your language, it is because a
hotfix is not available for that language.
To apply this hotfix, you must have Windows XP Service Pack 3
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
to obtain the latest Windows XP service pack
You do not have to restart the computer after you apply this
Hotfix replacement information
This hotfix does not replace any other hotfixes.
To have us enable this hotfix for you, go to the “Fix it for me
” section. If you would rather enable this hotfix yourself, go to the “Let me fix it myself
Fix it for me
To enable this hotfix automatically, click the Fix this problem
link. Then, click Run
in the File Download
dialog box, and follow the steps in this wizard.
- This wizard is temporarily in English only. However, the automatic fix also works for other language versions of Windows.
- If you are not on the computer that has the problem, you can save the automatic fix to a flash drive or to a CD, and then you can run it on the computer that has the problem.
Now go to the "Did this fix the problem
Let me fix it myselfImportant
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:
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.
- Locate the following registry
- On the Edit menu, point to
New, and then click DWORD Value.
- Type IdentityEncodingFormat, and
then press ENTER.
- On the Edit menu, click
- Type 0x1, and then click
- Exit Registry Editor.
Now go to the "Did this fix the problem
Did this fix the problem?
- 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
(mailto:firstname.lastname@example.org?Subject=KB957218 - Enable identity encoding format hotfix)
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
Collapse this tableExpand this table
|File name||File version||File
has confirmed that this is a problem in the Microsoft products that are listed
in the "Applies to" section.
For more information about
architecture, visit the following Microsoft Web site:
For more information about Internet Authentication Service (IAS),
visit the following Microsoft Web site:
for other considerations.