The remote server returned an error: (407) Proxy Authentication Required

I referred several websites, which had answer for this question "The remote server returned an error: (407) Proxy Authentication Required." ,but none were helpful. I wrote a sample code to check the proxy authentication in office. The code throws exception. My requirement:- Verify what the website returns. Outside office, the code works fine, but in office it throws an exception due to proxy. When I hardcode the credentials using new NetworkCredential, it works fine. ``` int ResponseCode; string url = "http://www.msftncsi.com/ncsi.txt"; WebRequest request = WebRequest.Create(url); request.Credentials = CredentialCache.DefaultCredentials; using (WebResponse response = request.GetResponse()) { Stream dataStream = response.GetResponseStream(); StreamReader reader = new StreamReader(dataStream); responseFromServer = reader.ReadToEnd(); ResponseCode = (int)((HttpWebResponse)response).StatusCode; reader.Close(); } ``` I do not want to Hardcode. I referred the solution in http://social.msdn.microsoft.com/Forums/is/csharpgeneral/thread/c06d3032-dceb-4a1a-bb6a-778fd13a938a, but even that didnt help. What am I missing?