C# HttpWebRequest The underlying connection was closed: An unexpected error occurred on a send

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I've been Googling and trying all the solutions I could find or think of myself. The site I'm trying to load is running TLS1.2 as is a few other sites I tried to test with to make sure it wasn't a TLS1.2 issue. The other sites loaded fine.

byte[] buffer = Encoding.ASCII.GetBytes(
    "mod=www&ssl=1&dest=account_settings.ws"
    + "&username=" + username.Replace(" ", "20%")
    + "&password=" + password.Replace(" ", "20%"));

ServicePointManager.MaxServicePointIdleTime = 1000;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

HttpWebRequest WebReq =
    (HttpWebRequest)WebRequest.Create(
        "https://secure.runescape.com/m=weblogin/login.ws");

WebReq.Method = "POST";
WebReq.KeepAlive = false;

WebReq.Referer =
    "https://secure.runescape.com/m=weblogin/loginform.ws"
    + "?mod=www&ssl=1&expired=0&dest=account_settings.ws";

WebReq.ContentType = "application/x-www-form-urlencoded";
WebReq.ContentLength = buffer.Length;
Stream PostData = WebReq.GetRequestStream();
PostData.Write(buffer, 0, buffer.Length);
PostData.Close();
HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();
Stream Answer = WebResp.GetResponseStream();
StreamReader _Answer = new StreamReader(Answer);
reply = _Answer.ReadToEnd();
curAccount++;
if (reply.Contains("Login Successful"))
{
     eturn true;
}
else
{
     eturn false;
}

No matter what I try I keep getting the exception

The underlying connection was closed: An unexpected error occurred on a send.

Under more details I found

Authentication failed because the remote party has closed the transport stream.

HttpWebRequest.GetRequestStream(), GetRequestStream() - Error The underlying connection was closed: An unexpected error occurred on a send � c# httpwebrequest. I am getting� Setting the HttpWebRequest.KeepAlive to false didn't work for me. Since I was accessing a HTTPS page I had to set the Service Point Security Protocol to Tls12.

I experienced this exception, and it was also related to ServicePointManager.SecurityProtocol.

For me, this was because ServicePointManager.SecurityProtocol had been set to Tls | Tls11 (because of certain websites the application visits with broken TLS 1.2) and upon visiting a TLS 1.2-only website (tested with SSLLabs' SSL Report), it failed.

An option for .NET 4.5 and higher is to enable all TLS versions:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
                                     | SecurityProtocolType.Tls11
                                     | SecurityProtocolType.Tls12;

The underlying connection was closed: An unexpected error , "But its give me this error for only one url and for anothers url its working well" - that's the important point. Which URL is it? Does the URL work� "Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host." The code which does the request is the following:

For .Net 4 use:

ServicePointManager.SecurityProtocol = (SecurityProtocolType)768 | (SecurityProtocolType)3072;

C# HttpWebRequest The underlying connection , I have a few vendors who I submit XML files via WebRequest. The system has worked I am now receiving an error, "The underlying connection was closed: An unexpected error occurred on a send.' This error occurs when� The underlying connection was closed: A connection that was expected to be kept alive was closed by the server. Additionally, the Status property on the thrown WebException will indicate the value WebExceptionStatus.KeepAliveFailure .

Code for WebTestPlugIn

public class Protocols : WebTestPlugin
{

    public override void PreRequest(object sender, PreRequestEventArgs e)
    {
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

    }

}

The underlying connection was closed: An unexpected error, C# HttpWebRequest The underlying connection was closed: An unexpected error occurred on a send., [Answered] RSS. 1 reply. Last post Feb 24� Fala ae galera. tive problemas ao publicar meu primeiro report, exibe o seguinte erro: The underlying connection was closed: An unexpected error occurred on a send

Your project supports .Net Framework 4.0 and .Net Framework 4.5. If you have upgrade issues

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

instead of can use;

ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

'The underlying connection was closed: An unexpected error , I am using the c# code and upon this line the connection was closed error HttpWebResponse response = (HttpWebResponse)request. The underlying connection was closed: An unexpected error occurred on a send. #51. When we send a web request to products/count.json (could be any api end point) it throws the error at GetResponse() "The underlying connection was closed: An

C# System.Net.WebException: The underlying connection was , existing connection was forcibly closed by the remote host."} Message: The underlying connection was closed: An unexpected error occurred on a send. This change lets you access the HttpWebRequest object. If you are using Microsoft Visual C#, the new method must be similar to the following. It is failing with the following error, Resolution: It is all because TLS, TLS 1.1 and TLS 1.2 not allowed in the server, Which is why the command failed, To resolve the issue, do the following, Open the Command prompt and run the below command, [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

"The underlying connection was closed: An unexpected error , Seems that the error is caused by http-connection being closed before all data is How do I fixed "The underlying connection was closed: An unexpected error occurred on a send. var httpWebRequest = (HttpWebRequest)WebRequest. SOLVED: The underlying connection was closed: An unexpected error occurred on a send when using PowerShell Invoke-Restmethod Invoke-WebRequest

WebException: The underlying connection was closed: An unexpected error occurred on a send. Here's my code Any ideas? HttpWebRequest request = (�

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