unresolved socket address

Good, I have made a class that makes a http connection to a url to download an excell file to a local directory. This class in a main method works fine but at the moment I transfer that class to a method in SAP Netweaver Developer Studio it is giving me the following error. This is my code of the method that downloads the Excell file:

File dir = new File(folderName);
            if (!dir.exists()) {
                if (!dir.mkdir()) {
                    return salida;
                }
            }
            File f = new File (folderName + "/" + fileName);
            //Creamos el proxy para poder conectarnos a la URL
            Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("10.65.4.1", 8080));

            String ruta = rutaFocus + fileName + descarga;

            URL url = new URL(ruta);
            HttpURLConnection uc = (HttpURLConnection) url.openConnection(proxy);

            uc.connect();
            int b = 0;
            while (b != -1) {
                b = in.read();
                if (b != -1) {
                    out.write(b);
                }
            }
            out.close();
            in.close();

But it returns the error in the line

 HttpURLConnection uc = (HttpURLConnection) url.openConnection(proxy)

giving as error:

  

org.w3c.www.protocol.http.HttpException: Connect timed out.

Someone could give me some explanation or why he returns the error. Thanks