JSI Tip 5991. Your Windows XP SP1 computers cannot communicate after 802.1x authentication succeeds?

You can successfully authenticate using 802.1x, but your Windows XP SP1 computers cannot communicate?

This problem is caused because Windows XP SP1 cannot receive and process multiple EAPOL keys.

NOTE: See How do I configure a Windows 2000 domain to support Microsoft Windows XP Professional client computers that are using IEEE 802.11 access with IEEE 802.1x authentication in a wireless network?