The remote host closed the connection. The error code is 0x800704CD
I receive error emails from my website whenever an exception occurs. I am getting this error:
The remote host closed the connection. The error code is 0x800704CD
and don't know why. I get about 30 a day. I can't reproduce the error either so can't track down the issue.
Website is ASP.NET 2 running on IIS7.
Stack trace:
at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect) at System.Web.Hosting.IIS7WorkerRequest.ExplicitFlush() at System.Web.HttpResponse.Flush(Boolean finalFlush) at System.Web.HttpResponse.Flush() at System.Web.HttpResponse.End() at System.Web.UI.HttpResponseWrapper.System.Web.UI.IHttpResponse.End() at System.Web.UI.PageRequestManager.OnPageError(Object sender, EventArgs e) at System.Web.UI.TemplateControl.OnError(EventArgs e) at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.default_aspx.ProcessRequest(HttpContext context) at System.Web.H ttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
I get this one all the time. It means that the user started to download a file, and then it either failed , or they cancelled it.
To reproduce the exception try do this yourself - however I'm unaware of any ways to prevent it (except for handling this specific exception only).
You need to decide what the best way forward is depending on your app.
As m.edmondson mentioned, "The remote host closed the connection." occurs when a user or browser cancels something, or the network connection drops etc. It doesn't necessarily have to be a file download however, just any request for any resource that results in a response to the client. Basically the error means that the response could not be sent because the server can no longer talk to the client(browser).
There are a number of steps that you can take in order to stop it happening. If you are manually sending something in the response with a Response.Write, Response.Flush, returning data from a web servivce/page method or something similar, then you should consider checking Response.IsClientConnected before sending the response. Also, if the response is likely to take a long time or a lot of server-side processing is required, you should check this periodically until the response.end if called. See the following for details on this property:
http://msdn.microsoft.com/en-us/library/system.web.httpresponse.isclientconnected.aspx
Alternatively, which I believe is most likely in your case, the error is being caused by something inside the framework. The following link may by of use:
http://blog.whitesites.com/fixing-The-remote-host-closed-the-connection-The-error-code-is-0x80070057__633882307305519259_blog.htm
The following stack-overflow post might also be of interest:
"The remote host closed the connection" in Response.OutputStream.Write
One can reproduce the error with the code below:
public ActionResult ClosingTheConnectionAction(){
try
{
//we need to set buffer to false to
//make sure data is written in chunks
Response.Buffer = false;
var someText = "Some text here to make things happen ;-)";
var content = GetBytes( someText );
for(var i=0; i < 100; i++)
{
Response.OutputStream.Write(content, 0, content.Length);
}
return View();
}
catch(HttpException hex)
{
if (hex.Message.StartsWith("The remote host closed the connection. The error code is 0x800704CD."))
{
//react on remote host closed the connection exception.
var msg = hex.Message;
}
}
catch(Exception somethingElseHappened)
{
//handle it with some other code
}
return View();
}
Now run the website in debug mode. Put a breakpoint in the loop that writes to the output stream. Go to that action method and after the first iteration passed close the tab of the browser. Hit F10 to continue the loop. After it hit the next iteration you will see the exception. Enjoy your exception :-)
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