WebProxy proxyObject = new WebProxy(ip, port); //str为IP地址 port为端口号  
                proxyObject.BypassProxyOnLocal = true;

                HttpWebRequest Req = (HttpWebRequest)WebRequest.Create("http://1111.ip138.com/ic.asp");
                Req.UserAgent = "MSIE6.0";
                Req.Method = "GET";
                Req.AllowAutoRedirect = false;
                Req.Timeout = 10000; //设定超时时间

                if (ip != "127.0.0.1")
                    Req.Proxy = proxyObject; //设置代理   
                HttpWebResponse Resp = (HttpWebResponse)Req.GetResponse();////////这里就报错了，远程服务器403错误，，怎么修改改一下啊？

using (StreamReader sr = new StreamReader(Resp.GetResponseStream(), code))
                {}