Configuring SSL on a Web Server or Web Site (IIS 6.0)
You can configure Secure Sockets Layer (SSL) security features on a Web server or a Web site to verify the integrity of your content, verify the identity of users, and encrypt network transmissions.
You must be a member of the Administrators group on the local computer to perform the following procedure or procedures. As a security best practice, log on to your computer by using an account that is not in the Administrators group, and then use the runas command to run IIS Manager as an administrator. At a command prompt, type runas /user:Administrative_AccountName "mmc %systemroot%\system32\inetsrv\iis.msc".
To configure SSL on a Web server or a Web site
If you set your Web site to require SSL, as in step 6 above, and you have not completed setting up SSL for the site, then users browsing your site will receive this error: "HTTP Error 403.4 - Forbidden: SSL is required to view this resource." To avoid this condition, either complete all the steps in the list above, or go back and clear the Require Secure Channel (SSL) check box (see step 6).