I ran a quick test using the following sample code and running the page via https. In my test the KML layer loaded fine. In your testing do you see any errors in the browser developer console?
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
<title></title>
<link rel="stylesheet" href="https://community.esri.com//js.arcgis.com/3.11/dijit/themes/tundra/tundra.css">
<link rel="stylesheet" type="text/css" href="https://community.esri.com//js.arcgis.com/3.11/esri/css/esri.css">
<style>
html, body { height: 100%; width: 100%; margin: 0; padding: 0; }
#map { height: 100%; margin: 0; padding: 0; }
#meta {
position: absolute;
left: 20px;
bottom: 20px;
width: 300px;
height: 100px;
z-index: 40;
background: #fff;
color: #777;
padding: 5px;
border: 2px solid #666;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
font-family: arial;
font-size: 0.9em;
}
#meta h3 {
color: #666;
font-size: 1.1em;
padding: 0px;
margin: 0px;
display: inline-block;
}
#loading {
float: right;
}
</style>
<script src="//js.arcgis.com/3.11/"></script>
<script>
var map;
require([
"esri/map", "esri/layers/KMLLayer",
"dojo/parser", "dojo/dom-style",
"dijit/layout/BorderContainer", "dijit/layout/ContentPane", "dojo/domReady!"
], function(
Map, KMLLayer,
parser, domStyle
) {
map = new Map("map", {
basemap: "topo",
center: [-108.663, 42.68],
zoom: 6
});
parser.parse();
var kmlUrl = document.location.protocol + "//dl.dropbox.com/u/2654618/kml/Wyoming.kml";
var kml = new KMLLayer(kmlUrl);
map.addLayer(kml);
});
</script>
</head>
<body class="tundra">
<div data-dojo-type="dijit/layout/BorderContainer"
data-dojo-props="design:'headline',gutters:false"
style="width: 100%; height: 100%; margin: 0;">
<div id="map"
data-dojo-type="dijit/layout/ContentPane"
data-dojo-props="region:'center'">
<div id="meta">
The map displays a simple KML file that was created using Google Earth and
is hosted on an Esri server. Symbology and attributes are honored.
<div>
</div>
</div>
</body>
</html>
