A Windows Vista-based or Windows Server 2008-based computer does not response to 802.1X authentication requests for 20 minutes after a failed authentication
Consider the following scenario:
- You have a computer that is running Windows Vista or Windows Server 2008 in a networked environment.
- You enabled 802.1X authentication for a network connection on the computer.
- The 802.1X authentication fails because of some transient error conditions.
In this scenario, the computer does not respond to any other authentication requests for 20 minutes. Therefore, the computer cannot access the network, or the computer only has limited access to the network.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB957931.