DOCUMENT:Q186812 03-JUN-2002 [iis] TITLE :PRB: Error Message: 403.7 Forbidden: Client Certificate Required PRODUCT :Internet Information Server PROD/VER::3.0,4.0,5.0 OPER/SYS: KEYWORDS:kbOSWin2000 kbiis500prod2web kbhttp4037 kbProd2Web ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server versions 3.0, 4.0 - Microsoft Internet Information Services version 5.0 ------------------------------------------------------------------------------- SYMPTOMS ======== When you try to establish communication with a Web site that requires client authentication, you may receive the following error messages: HTTP Error 403 403.7 Forbidden: Client certificate required CAUSE ===== This error occurs when the resource that you are trying to access requires that your browser has a client Secure Sockets Layer (SSL) certificate that the server recognizes. This is used for authenticating you as a valid user of the resource. Contact the administrator of the Web server to obtain a valid client certificate. There are several possible causes of this problem: - The root certificate (certificate authority certificate) of the client certificate issuing server is not installed on the computer that is running IIS. -or- - The client certificate has expired or the effective time has not been reached. -or- - The client certificate has been revoked. RESOLUTION ========== Depending on the cause of your problem, try one of the following resolutions: - Download the root server certificate in a browser on the server computer. Run the Iisca.exe command line utility that is located in the Inetsrv directory. - Check the effective date on the client certificate and make sure that the date and time has arrived. Check the expiration date and make sure that the certificate has not expired. - Contact your certificate authority to see if your certificate has expired. MORE INFORMATION ================ Microsoft Internet Explorer 4.0 and IIS 4.0 store their root certificates in different locations of the registry. The Iisca.exe utility synchronizes the two root certificate stores. Additional query words: 403.7 IE Client SSL ====================================================================== Keywords : kbOSWin2000 kbiis500prod2web kbhttp4037 kbProd2Web Technology : kbiisSearch kbiis500 kbiis400 kbiis300 Version : :3.0,4.0,5.0 Issue type : kbprb ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2002.