My Proxy.config file: Code from Default.aspx: require(["esri/config", "esri/urlUtils"], function (esriConfig, urlUtils) { esriConfig.defaults.io.proxyUrl = serverLink + "/Maps/iMapTest/proxy/proxy.ashx"; esriConfig.defaults.io.alwaysUseProxy = false; urlUtils.addProxyRule({ urlPrefix: dataLink3 + "/Geoprocessing", proxyUrl: serverLink + "/Maps/iMapTest/proxy/proxy.ashx" }); });