Internet Explorer 9 and Certificate Enrollment using Certificate Authority Web Enrollment

If you run into an issue where you are unable to download or save certificates using Internet Explorer 9 (IE 9) and the Certificate Authority Web Enrollment service of a certification authority, you should be sure to disable the enhanced security option of Internet Explorer. See TechNet Wiki article: https://social.technet.microsoft.com/wiki/contents/articles/you-cannot-download-ca-certificate-from-web-enrollment-pages.aspx for more details.