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Windows activation or validation fails when you try to activate Windows operating systems over the Internet. These problems may occur when you connect to the Internet through a proxy server on which Basic authentication is enabled. Note: If the proxy server is configured for Basic authentication, the server requires that you type a username and a password. However, the activation user interface does not let you enter these credentials.

Therefore, the Basic authentication fails, and activation fails. If you experience other errors than those mentioned above when you try to activate Windows, go to the following Windows websites for additional troubleshooting information:. Get help with activation errors Why can't I activate Windows?

Use the Windows Activation Wizard to activate Windows through the automated telephone system. To do this, follow these steps for your version of the operating system. Swipe in from the right edge of the screen, and then tap Search.

Or, if you are using a mouse, point to the lower-right corner of the screen, and then click Search. Method 2: Configure the proxy server to disable Basic authentication Configure the proxy server to disable Basic authentication.

For information about how to use this method, see the documentation that is included with the proxy software. Method 3: Configure the proxy server to exclude URLs for certificate revocation lists Configure the proxy server to exclude the URLs for the certificate revocation lists CRLs from the requirements for Basic authentication.

To do this, configure the following list of CRLs to be unauthenticated on the proxy server:. Note Microsoft cannot supply IP addresses or ranges of the servers listed above. The URL must be used. For more information about Windows Vista Volume Activation 2. To search the Microsoft Knowledge Base, go to the following Microsoft website:. Windows 11 Windows 10 Windows 8. Type SLUI 04, and then tap or click the displayed icon to open the wizard.

Click Start , and then click Run. Need more help? Expand your skills. Get new features first. Was this information helpful? Yes No. Thank you! Any more feedback? The more you tell us the more we can help. Can you help us improve? Resolved my issue. Clear instructions. Easy to follow. No jargon. Pictures helped. Didn't match my screen. Incorrect instructions. Too technical. Not enough information. Not enough pictures.

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