A Windows Vista-based computer may be unable to connect to the network after you configure the computer to use machine authentication and to validate the RADIUS server certificate

When you configure a Windows Vista-based computer to use machine authentication and to validate the RADIUS server certificate, the computer may be unable to connect to the network.

This problem occurs when the following conditions are true:

    When you configure the network authentication method, you click to select the following check boxes:

      Validate Server Certificate
        Connect to these servers
          You do not enter any server name in the text box under the Connect to these servers check box.

          CAUSE

          When machine authentication is used, the Onex module does not prompt the user to accept the certificate of the RADIUS server.

          WORKAROUND

          To work around this issue, follow these steps:

          1. Click Start, type services.msc, in the Start Search box, and then press ENTER. If you are prompted for an administrator password or for confirmation, type the password, or provide confirmation.
          2. In the Services window, click the Standard tab, right-click Wired AutoConfig, and then click Start to enable the Wired AutoConfig service.
          3. Close the Services window.
          4. Click Start, click Control Panel, click Network and Internet, click Network and Sharing Center, and then click Manage network connections.
          5. Right-click the connection for which you want to enable 802.1X authentication, and then click Properties.
          6. Click the Authentication tab, and then click to select the Enable IEEE 802.1X authentication check box.
          7. In the Choose a network authentication method list, click Protected EAP (PEAP), and then click Settings.
          8. Click to select the Validate Server Certificate check box and the Connect to these servers check box.
          9. In the text box under the Connect to these servers check box, enter the FQDN of the RADIUS servers with which you want to authenticate.

          APPLIES TO
            Windows Vista Enterprise 64-bit Edition
              Windows Vista Home Basic 64-bit Edition
                Windows Vista Home Premium 64-bit Edition
                  Windows Vista Ultimate 64-bit Edition
                    Windows Vista Business
                      Windows Vista Business 64-bit Edition
                        Windows Vista Enterprise
                          Windows Vista Home Basic
                            Windows Vista Home Premium
                              Windows Vista Ultimate

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                              Microsoft Knowledge Base Article

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