Daniel,if you snoop the web traffic when you launch your application you should see that a request to retreive the private webmap json is specifically whats failing.http://www.arcgis.com/sharing/rest/content/items/cd23069c1aeb44f79e072932d30bccac/data?f=jsonthis can be resolved by adding the following serverUrl tag to your proxy.config.<serverUrl url="http://www.arcgis.com"
username="john"
password="doe"
matchAll="true">
</serverUrl>
after updating your proxy.config, try adapting this sample (i just confirmed it works fine)
<!DOCTYPE html>
<html>
<head>
<title>Create a Web Map</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
<link rel="stylesheet" type="text/css" href="http://js.arcgis.com/3.8/js/esri/css/esri.css">
<style>
html,body,#mapDiv,.map.container{
padding:0;
margin:0;
height:100%;
}
</style>
<script>var dojoConfig = { parseOnLoad:true };</script>
<script src="http://js.arcgis.com/3.9compact/"></script>
<script>
require([
"esri/map",
"esri/arcgis/utils",
"esri/urlUtils",
"esri/config",
"dojo/domReady!"
], function (Map, arcgisUtils, urlUtils, esriConfig) {
//define proxy rule
urlUtils.addProxyRule({
proxyUrl: "/sproxy/proxy.ashx",
urlPrefix: "www.arcgis.com/sharing/rest"
});
//swap for your own private webmap
arcgisUtils.createMap("cd23069c1aeb44f79e072932d30bccac", "mapDiv");
});
</script>
</head>
<body>
<div id="mapDiv"></div>
</body>
</html>
