fiberOptics fiberOptics - 2 years ago 126
C# Question

No connection could be made because the target machine actively refused it

I'm using the WCF4.0 template -REST. I'm trying to make a method that uploads a file using a stream.

The problem always occur at

Stream serverStream = request.GetRequestStream();

Class for streaming:

namespace LogicClass
public class StreamClass : IStreamClass
public bool UploadFile(string filename, Stream fileStream)
FileStream fileToupload = new FileStream(filename, FileMode.Create);
byte[] bytearray = new byte[10000];
int bytesRead, totalBytesRead = 0;
bytesRead = fileStream.Read(bytearray, 0, bytearray.Length);
totalBytesRead += bytesRead;
} while (bytesRead > 0);

fileToupload.Write(bytearray, 0, bytearray.Length);
catch (Exception ex) { throw new Exception(ex.Message); }
return true;

REST project:

[WebInvoke(UriTemplate = "AddStream/{filename}", Method = "POST", BodyStyle = WebMessageBodyStyle.Bare)]
public bool AddStream(string filename, System.IO.Stream fileStream)
LogicClass.FileComponent rest = new LogicClass.FileComponent();
return rest.AddStream(filename, fileStream);

Windows Form project: for testing

private void button24_Click(object sender, EventArgs e)
byte[] fileStream;
using (FileStream fs = new FileStream("E:\\stream.txt", FileMode.Open, FileAccess.Read, FileShare.Read))
fileStream = new byte[fs.Length];
fs.Read(fileStream, 0, (int)fs.Length);

string baseAddress = "http://localhost:3446/File/AddStream/stream.txt";
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(baseAddress);
request.Method = "POST";
request.ContentType = "text/plain";
Stream serverStream = request.GetRequestStream();
serverStream.Write(fileStream, 0, fileStream.Length);
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
int statusCode = (int)response.StatusCode;
StreamReader reader = new StreamReader(response.GetResponseStream());

I've turned off the firewall and my Internet connection, but the error still exists. Is there a better way of testing the uploading method?

Stack trace:

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)

Answer Source

"Actively refused it" means that the host sent a reset instead of an ack when you tried to connect. It is therefore not a problem in your code. Either there is a firewall blocking the connection or the process that is hosting the service is not listening on that port. This may be because it is not running at all or because it is listening on a different port.

Once you start the process hosting your service, try netstat -anb (requires admin privileges) to verify that it is running and listening on the expected port.

update: On Linux you may need to do netstat -anp instead.

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