Article ID: 931855 - Last Review: December 1, 2007 - Revision: 1.2

Authentication fails when you configure a Windows XP-based computer to use IEEE 802.1X authentication to connect to a network

When you configure a Microsoft Windows XP-based computer to use IEEE 802.1X authentication to connect to a network, the authentication fails.

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CAUSE

This problem occurs when the computer name contains a double-byte character or a hyphen (-). 802.1X uses the Extensible Authentication Protocol (EAP) for message exchange during the authentication process. The Windows implementation of the Extensible Authentication Protocol (EAP) does not support these characters.

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WORKAROUND

To work around this problem, change the name of the computer to use single-byte characters without hyphens.

Click Start, right-click My Computer, and then click Properties.
On the Computer Name tab, click Change.
Rename the computer, and then click OK two times.
Restart the computer.

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MORE INFORMATION

When this problem occurs, an error that resembles the following is logged in the EAP log:

[1244] 20:12:06:422: ElGetUserIdentity entered
[1244] 20:12:06:422: ElGetEapUserInfo: Get value succeeded: EapTypeId=<25>, SSIDLen=<32>, AuthData=(610)
[1244] 20:12:06:422: ElGetEapUserInfo: Get value succeeded: EapTypeId=<25>, SSIDLen=<32>, AuthData=(610)
[1244] 20:12:06:422: ElGetUserIdentityOptimized: ElGetEapUserInfo: Got user blob, size = (610)
[1244] 20:12:06:422: ElGetCustomAuthData: SSIDLen=<32>, EapTypeId=<25>, Offset=<52/180>, dwAuthData=<62>
[1244] 20:12:06:422: ElGetCustomAuthData: SSIDLen=<32>, EapTypeId=<25>, Offset=<52/180>, dwAuthData=<62>
[1244] 20:12:06:422: ElGetUserIdentityOptimized: WideCharToMultiByte (가나다\bb40480) failed: 122
[1244] 20:12:06:422: ElGetUserIdentity: ElGetUserIdentityOptimized got identity without user module intervention
[1244] 20:12:06:422: ElGetUserIdentity completed with error 122

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