C# Webservice WebException:无法连接到IIS中的远程服务器

当我想连接到某个主机时，我遇到了一些问题

我构建了一个web服务，从android智能手机获取图片。在安卓系统中，我安装了IP网络摄像头，使安卓智能手机成为IP摄像头。为了从android获取图片，我开发了web服务，根据android URL获取图片

当我在本地测试webservice时，它工作了。但是当我在IIS服务器中部署web服务时，web服务出现了问题。无法连接到远程服务器

这是个例外

System.Net.WebException: Unable to connect to the remote server
---> System.Net.Sockets.SocketException: A connection attempt failed because the
     connected party did not properly respond after a period of time, or
     established connection failed because connected host has failed to respond
     172.21.2.1:8080
 at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot,
    SocketAddress socketAddress)
 at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure,
    Socket s4, Socket s6, Socket& socket, IPAddress& address,
    ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout,
    Exception& exception)
 --- End of inner exception stack trace ---
 at System.Net.HttpWebRequest.GetResponse()
 at PhotoScanFromAndroid.ImageProcess.SavePhoto()
 in D:\Project\PhotoScanFromAndroid\PhotoScanFromAndroid\ImageProcess.cs:line 45

这是从Android获取图片的功能：

public int SavePhoto()
{
    try
    {
        String url = ConfigurationManager.AppSettings["CameraURL"];
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

        // execute the request
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        // we will read data via the response stream
        Stream ReceiveStream = response.GetResponseStream();

        byte[] buffer = new byte[5000000];
        //FileStream outFile = new FileStream(filename, FileMode.Create);
        using (BinaryReader br = new BinaryReader(ReceiveStream))
        {
            buffer = br.ReadBytes(5000000);
            br.Close();
        }
        return this.SavePhotoLinq(buffer).id_photo;
    }
    catch (Exception e)
    {
        //Assembly SampleAssembly;
        TextWriter tw = new StreamWriter(getPath(), true);
        tw.WriteLine(DateTime.UtcNow);
        tw.WriteLine(e.ToString());
        tw.WriteLine();
        tw.Close();
        return -1;
    }
}

这是web.config

---

如果它表明您无法连接到服务器，这意味着什么？您无法连接到服务器。你先检查过了吗？连接、权限、防火墙等。请尝试从您的Web服务计算机ping和访问。用于调查web请求。在

response.GetResponseStream（）处添加调试断点