Understanding the HTML-based model
If you choose the HTML-based model, all host session configuration information is contained in the HTML file itself, and nothing more is needed to define host sessions. Therefore, you are not required to use the configuration server to specify sessions, which means you do not have to open up a port on your firewall. If you allow users to save changes to the host session configuration information, their changes are stored on the local file system where the browser is running.
You are suggested not using the port 8999 because you do not need to start the ZIE server by using the HTML-based model. In this case the server resource is saved.
This option of defining configuration information in the HTML files is only available in clients that are created using the Deployment Wizard.