The underlying connection was closed....

Rajveer singh

Hi all,

Error :

The underlying connection was closed a connection that was expected to be kept alive was closed by the server

I'm using window form application and use API with Basic authentication, if I continue sending a 4-5 request to the server I again send request after 10-15 seconds then raised the issue. My Code here.

HttpWebRequest req = (HttpWebRequest)(HttpWebRequest.Create(URL));

req.Method = "POST";

req.ProtocolVersion = HttpVersion.Version10;

req.ContentType = "application/xml";

req.Timeout = ResponseTimeOut;

req.KeepAlive = false;

req.Headers.Set(HttpRequestHeader.Authorization, "Basic dshgfhjhgdshjsdhh==");

d1 = DateTime.Now;

string content = authXMLString;

req.ContentLength = content.Length;

Stream wri = req.GetRequestStream();

byte[] array = Encoding.UTF8.GetBytes(content);

wri.Write(array, 0, array.Length);

wri.Flush();

wri.Close();

HttpWebResponse HttpWResp = (HttpWebResponse)req.GetResponse();

int resCode = (int)HttpWResp.StatusCode;

StreamReader reader = new StreamReader(HttpWResp.GetResponseStream(), System.Text.Encoding.UTF8);

string resultData = reader.ReadToEnd();

d2 = DateTime.Now;

decodedresult = resultData;

decodedresult = decodedresult.Replace("<", "<");

decodedresult = decodedresult.Replace(">", ">");

4 Replies

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Rajveer singh8y ago
Hello Brajesh Kumar

already use this property request.KeepAlive = false; but no effect, I think got this problem due to the server problem.

Please clarify me.
Brajesh Kumar8y ago
Hi Rajveer

Can you play with KeepAlive on WebRequest setting it to true and false and see if that gives you better results?

public class MyHttpConnection : HttpConnection
{
protected override HttpWebRequest CreateHttpWebRequest(RequestData requestData)
{
var request = base.CreateHttpWebRequest(requestData);
request.KeepAlive = false;
return request;
}
}

And register this as the IConnection on the constructor in you ConnectionSettings

We also set TCPKeepAlive's which you could try and kill it by adding this override:

protected override void AlterServicePoint(ServicePoint requestServicePoint, RequestData requestData)
{
requestServicePoint.UseNagleAlgorithm = false;
requestServicePoint.Expect100Continue = false;
requestServicePoint.ConnectionLimit = 10000;
}

Also did you gothrough with this
https://support.microsoft.com/en-us/help/941633/fix-error-message-when-you-run-a-client-application-that-is-built-on-t
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=209544&SiteID=1&PageID=1
Rajveer singh8y ago
this already done.
Brajesh Kumar8y ago
Hi Rajveer
In your webconfig you can use this code

or you can follow the following threads

1. https://stackoverflow.com/questions/21728773/the-underlying-connection-was-closed-an-unexpected-error-occurred-on-a-receiv
2.https://forums.asp.net/t/1910933.aspx?The+underlying+connection+was+closed+A+connection+that+was+expected+to+be+kept+alive+was+closed+by+the+server+
3. https://stackoverflow.com/questions/14052218/connection-that-was-expected-to-be-kept-alive-was-closed-by-the-server-in-asp-ne
4.https://support.esri.com/en/technical-article/000009116