The remote host closed the connection The error code is 0x800704CD

Question

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 HttpApplication CallHandlerExecutionStep System Web HttpApplication IExecutionStep Execute     at   System Web HttpApplication ExecuteStep IExecutionStep   step  Boolean amp  completedSynchronously

User · Answer

I was getting this on an asp net 2 0 iis7 Windows2008 site   Same code on iis6 worked fine   It was causing an issue for me because it was messing up the login process   User would login and get a 302 to default asxp  which would get through page load  but not as far as pre-render before iis7 would send a 302 back to login aspx without the auth cookie   I started playing with app pool settings  and for some reason  enable 32 bit applications  seems to have fixed it   No idea why  since this site isn t doing anything special that should require any 32 bit drivers   We have some sites that still use Access that require 32bit  but not our straight SQL sites like this one

User · Answer

I got this error when I dynamically read data from a WebRequest and never closed the Response       protected System IO Stream GetStream string url                try                       System IO Stream stream   null              var request   System Net WebRequest Create url               var response   request GetResponse                 if  response    null                    stream   response GetResponseStream                        I never closed the response thus resulting in the error                 response Close                               response   null              request   null               return stream                    catch  Exception              return null

User · Answer

I too got this same error on my image handler that I wrote  I got it like 30 times a day on site with heavy traffic  managed to reproduce it also  You get this when a user cancels the request  closes the page or his internet connection is interrupted for example   in my case in the following row   myContext Response OutputStream Write buffer  0  bytesRead     I can   t think of any way to prevent it but maybe you can properly handle this  Ex           try                                       myContext Response OutputStream Write buffer  0  bytesRead                            catch  HttpException ex                        if  ex Message StartsWith  The remote host closed the connection                        do nothing             else                   handle other errors                               catch  Exception e                          handle other errors                   finally            close streams etc

User · Answer

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

User · Answer

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    quot The remote host closed the connection quot  in Response OutputStream Write

User · Answer

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  lt  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  -

[asp.net] The remote host closed the connection. The error code is 0x800704CD

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