Configuring the HTML5 Viewer to be used without an internet connection, only an intranet connection

Overview:
The HTML5 viewer requires ESRI javascript files to run.  There is a setting on the HTML5 viewer to allow it to use local copies of the files instead

Solution:
Edit the Index.html file typically located at C:\inetpub\wwwroot\Html5Viewer\ and look for the following lines of code:
 

// Uncomment the below line to only use local copies of Esri API files. This is done automatically in the Geocortex Mobile App Framework.
        //var geocortexUseLocalEsriApi = true;

Remove the comments on the second line, the result will be:
 

// Uncomment the below line to only use local copies of Esri API files. This is done automatically in the Geocortex Mobile App Framework.
        var geocortexUseLocalEsriApi = true;