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<serverUrl url="http://yourserver/arcgis/rest/services" matchAll="true"> </serverUrl>
500 TrustFailure 323ms /jsapi...ompact/ (line 15) "NetworkError: 500 TrustFailure - https://dmzarcsrv001/proxy/proxy.ashx?https://dmzarcsrv001/arcgis/rest/services/Test/Scratch/MapServer?f=json&dpi=96&transparent=true&format=png8"
<!DOCTYPE html>
  <html>
  <head>
  <title>Create a Web Map</title>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=7, IE=9, IE=10">
  <link rel="stylesheet" type="text/css" href="https://serverapi.arcgisonline.com/jsapi/arcgis/3.5/js/esri/css/esri.css">
  <style>
    html,body,#mapDiv,.map.container{
      padding:0;
      margin:0;
      height:100%;
    }
    #legendDiv{
      background-color: #fff;
      position: absolute !important;
      z-index: 99;
      top:10px;
      right:20px;
    }
  </style>
  <script>var dojoConfig = { parseOnLoad:true };</script>
  <script src="https://serverapi.arcgisonline.com/jsapi/arcgis/3.5compact/"></script>
  <script>
    dojo.require("esri.map");
    dojo.require("esri.arcgis.utils");
    dojo.require("esri.dijit.Legend");
 dojo.require("esri.IdentityManager");
    var map;
  
    function init(){
 
 esri.config.defaults.io.proxyUrl = "https://dmzarcsrv001/proxy/proxy.ashx";
 esri.config.defaults.io.alwaysUseProxy = true;
 
      map = new esri.Map("mapDiv", {
      center: [-56.049, 38.485],
      zoom: 3,
      basemap: "streets"
    });
 var dynamicMapServiceLayer = new esri.layers.ArcGISDynamicMapServiceLayer("https://dmzarcsrv001/arcgis/rest/services/Test/Scratch/MapServer")
 map.addLayer(dynamicMapServiceLayer); 
   
    }
    dojo.ready(init);
 
  </script>
  </head>
  <body>
    <div id="mapDiv"></div>
    <div id="legendDiv"></div>
 
  </body>
  </html><?xml version="1.0" encoding="utf-8" ?> <!-- Proxy config is used to set the ArcGIS Server services that the proxy will forward to. mustMatch: true to only proxy to sites listed, false to proxy to any site --> <ProxyConfig mustMatch="true"> <serverUrls> <!-- serverUrl options: url = location of the ArcGIS Server, either specific URL or stem matchAll = true to forward any request beginning with the url token = (optional) token to include for secured service dynamicToken = if true, gets token dynamically with username and password stored in web.config file's appSettings section. --> <serverUrl url="https://sampleserver1.arcgisonline.com/arcgis/rest/services/" matchAll="true"></serverUrl> <serverUrl url="https://sampleserver2.arcgisonline.com/arcgis/rest/services/" matchAll="true" token=""></serverUrl> <serverUrl url="https://server.arcgisonline.com/arcgis/rest/services/" matchAll="true"></serverUrl> <serverUrl url="https://orthogonal.esri.com/arcgis/rest/services/" matchAll="true"></serverUrl> <serverUrl url="https://hummer/ArcGIS/rest/services" matchAll="true" dynamicToken="true"></serverUrl> <serverUrl url="https://services.arcgisonline.com/arcgis/rest/services/" matchAll="true"></serverUrl> <serverUrl url="https://dmzarcsrv001/arcgis/rest/services/" matchAll="true"></serverUrl> <serverUrl url="https://www.arcgis.com" matchAll="true"></serverUrl> <serverUrl url="http://www.google.it" matchAll="true"></serverUrl> <serverUrl url="http://hydro-gis.jrc.ec.europa.eu/arcgis/rest/services" matchAll="true"></serverUrl> <serverUrl url="http://dmzarcsrv001/dev" matchAll="true"></serverUrl> </serverUrls> </ProxyConfig>