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When you successfully log on to a wireless or wired network that uses Protected Extensible Authentication Protocol (PEAP) authentication, your credentials are automatically stored in the computer for reuse. For example, when you shut down and then restart your computer, you are automatically logged on to the network. There is no option that you can configure in Windows XP to prevent the operating system from storing your credentials. By design, the cached credentials are not deleted and do not time out unless the user does not authenticate or the wireless or wired network is removed from the preferred list. However, you can delete the registry subkey in which your user credentials are stored. If you do this, you are prompted to enter your credentials the next time that you log on to the network.
This article helps you remove cached user credentials that are used for PEAP authentication on networks.
How to remove cached user credentials that are used for PEAP authentication (for 802.11 wireless and wired) connections
Important 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:
322756 How to back up and restore the registry in Windows
To remove your cached user credentials that are used for PEAP authentication, delete the following registry subkeys, as appropriate: