To make your Intraweb site support SSL you have to follow the following procedure.
1. Create a "certificate request" in your IIS Manager.
2. Use this request file to buy a certificate from a provider. (like comodo.com)
3. Add the certificate file to the IIS Manager certificate list.
4. Add https to your site's bindings.
For more informations visit the following site:
https://www.sslshopper.com/article-installing-an-ssl-certificate-in-windows-server-2008-iis-7.0.html