# The page requires a valid client certificate
The page you are trying to view requires the use of a valid client certificate. Your client certificate has expired or is not yet valid. The client certificate is used for identifying you as a valid user of the resource.
Please try the following: Click the Refresh button to try again, if you have changed your client certificate. Contact the Web server's administrator to obtain a valid client certificate. If you believe you should be able to view this directory or page, please contact the Web site administrator by using the e-mail address or phone number listed on the home page. ## HTTP 403.17 - Forbidden: Client certificate has expired or is not yet valid Internet Information Services Technical Information (for support personnel) More information: Microsoft Support