c# - System.Net.WebException: The underlying connection was closed: The connection was closed unexpectedly

Question

I'm writing a .NET application which is supposed to post data to another .NET application. I use the following code to request the login page

WebProxy proxy = new WebProxy("http://proxy:80/", true);
HttpWebRequest webRequest = WebRequest.Create(LOGIN_URL) as HttpWebRequest;
//proxy.Credentials = new NetworkCredential("myusername", "mypassword", "domain"); 
// webRequest.Proxy = proxy;
webRequest.Proxy = WebRequest.DefaultWebProxy;

StreamReader responseReader = new StreamReader
                                  (webRequest.GetResponse().GetResponseStream());
string responseData = responseReader.ReadToEnd();

but it fails on this line

StreamReader responseReader = new StreamReader
                                  (webRequest.GetResponse().GetResponseStream());

with the error message :

System.Net.WebException: The underlying connection was closed: The connection was 
                         closed unexpectedly.

Answer 1

If you are using .NET 2.0 or above can you enable network tracing and see what's actually happening over the wire. In that way you can get more information about this particular exception.

See following link for more details, http://msdn.microsoft.com/en-us/library/hyb3xww8%28VS.80%29.aspx