This tool is used to disable HTTP (web browser) access to your site.   Stopping the site here will cause a "Web Page Unavailable" page to be displayed when someone visits your site.

Note that the "Web Page Unavailable" page will only be displayed when you visit  If you visit a subdirectory (such as you will see a generic IIS 404 error.

Stopping the site with this tool does not affect email or FTP access, only HTTP access.