ServicePoint.BindIPEndPointDelegate freeze http request RRS feed

  • Question

  • I have 2 IP addresses on my server. By default, first interface's ip uses in every application. But i want bind my c# program to another ip. I use code from this thread Choose one of many Internet connections for an application . All works correctly, but one moment. My simple http request by default ip is faster more than 50ms than binded. Why so? I suspect it because i use BindIPEndPointDelegate, but i dont understand why.

    UseIP ip = new UseIP("");
    HttpWebRequest req = ip.CreateWebRequest(new Uri(""));
    using(WebResponse response = req.GetResponse()) {
     Stream dataStream = response.GetResponseStream();
     StreamReader reader = new StreamReader(dataStream);
     string responseFromServer = reader.ReadToEnd();
    public class UseIP {
     public string IP {
      private set;
     public UseIP(string IP) {
      this.IP = IP;
     public HttpWebRequest CreateWebRequest(Uri uri) {
      ServicePoint servicePoint = ServicePointManager.FindServicePoint(uri);
      servicePoint.BindIPEndPointDelegate = (servicePoint1, remoteEndPoint, retryCount) => {
       IPAddress address = IPAddress.Parse(this.IP);
       return new IPEndPoint(address, 0);
      //Will cause bind to be called periodically
      servicePoint.ConnectionLeaseTimeout = 0;
      HttpWebRequest req = (HttpWebRequest) WebRequest.Create(uri);
      //will cause bind to be called for each request (as long as the consumer of the request doesn't set it back to true!
      req.KeepAlive = false;
      return req;

    Tuesday, March 5, 2019 7:04 AM


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