c# - Replicate IO Exception Error -

i able reproduce following error:

  ioexception: unable read data transport connection: existing connection forcibly closed remote host. 

any ideas on how can making web request , causing error occur?

i've tried making web request , unplugging network cable didn't reproduce error, i'm intrigued how can make happen.

the last line produce exception.

the idea is: creating tcp listener (or http listener) , closing connection without sending valid http response.

taskcompletionsource<object> tcs = new taskcompletionsource<object>(); task.run(() => {     tcplistener listener = new tcplistener(8080);     listener.start();     tcs.trysetresult(null);     while (true)     {         listener.accepttcpclient().close();     } });  await tcs.task; //wait till tcplistener ready  webclient wc = new webclient(); var str = await wc.downloadstringtaskasync("http://localhost:8080");