When Internet Explorer Enhanced Security Configuration is enabled, the security settings for all intranet sites are set to ...

When Internet Explorer Enhanced Security Configuration is enabled, the security settings for all intranet sites are set to High. As a result, you are prompted for your credentials (your user name and password) each time you visit intranet sites that have not been added to the Local intranet zone. If you routinely use intranet sites and you know those sites are trustworthy, you can add them to the Local intranet zone in Internet Explorer.