Microsoft KB Archive/938113

= A Windows XP SP2-based client computer cannot reconnect to the network after you restore the WAN link between the RADIUS server and the switch =

Article ID: 938113

Article Last Modified on 6/26/2007

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APPLIES TO

 Microsoft Windows XP Service Pack 2, when used with:  Microsoft Windows XP Home Edition

 Microsoft Windows XP Professional 

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SYMPTOMS
Consider the following scenario:
 * You configure a Microsoft Windows XP Service Pace 2 (SP2)-based client computer to use IEEE 802.1X authentication.
 * The computer is in a local area network (LAN) environment.
 * The wide area network (WAN) link between the Remote Authentication Dial-In User Service (RADIUS) server and the switch is broken.
 * The client computer tries several times to reauthenticate. However, it remains disconnected from the WAN.

When you restore the WAN link in this scenario, the client computer remains disconnected.



CAUSE
When the WAN link is broken, the network adapter loses its association with the port at the MAC layer. Therefore, the client computer remains disconnected after the WAN link is restored.



WORKAROUND
To work around this problem, use one of the following methods:
 * Restart the client computer.
 * Disconnect the network cable, and then reconnect it to the computer.
 * Disable the network adapter, and then re-enable it.

Additional query words: Ethernet

Keywords: kbexpertiseinter kbhowto kbprb KB938113

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