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POTrouble downloading a file
 

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    <p>I am trying to download a file from a C# application. I have tried two different methods, but both yield the same response: "The remote server returned an error: (401) Unauthorized."</p> <p>I am pretty sure this is a credentials issue (because of the 401). If I navigate to the url from a browser, and enter the very same credentials provided, the file downloads just fine. In "Attempt 2" (below), for authtype, I have tried: NTLM, Basic, Negotiate, and Digest without any luck. </p> <p>Does anyone see what I might be doing wrong here?</p> <p>Thanks for the help!</p> <p>Attempt 1:</p> <pre><code>string username = "username"; string password = "password"; string domain = "domain"; string url = @"http://LiveLinkInstance.com/livelink/llisapi.dll/999999/WordDocument.docx?func=doc.Fetch&amp;nodeid=999999&amp;ReadOnly=True&amp;VerNum=-2&amp;nexturl=/livelink/llisapi.dll?func=ll&amp;objId=888888&amp;objAction=browse&amp;viewType=1"; // Create an instance of WebClient WebClient client = new WebClient(); client.Proxy = null; client.Credentials = new System.Net.NetworkCredential(username, password, domain); client.DownloadFile(new Uri(url), @"C:\FileDownloads\test.txt"); </code></pre> <p>Attempt 2:</p> <pre><code>string username = "username"; string password = "password"; string domain = "domain"; string url = @"http://LiveLinkInstance.com/livelink/llisapi.dll/999999/WordDocument.docx?func=doc.Fetch&amp;nodeid=999999&amp;ReadOnly=True&amp;VerNum=-2&amp;nexturl=/livelink/llisapi.dll?func=ll&amp;objId=888888&amp;objAction=browse&amp;viewType=1"; HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url); string credentials = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(domain + "\\" + username + ":" + password)); wr.Headers.Add("Authorization", "Basic " + credentials); CredentialCache cc = new CredentialCache(); cc.Add(new Uri(url), "NTLM", new NetworkCredential(username, password, domain)); wr.Credentials = cc; Stream str = ws.GetResponseStream(); </code></pre>
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    1. COIn attempt #2 the manual setting of the header seems redundant (even conflicting) with the use of CredentialCache. Then try and guess the settings (with/without domain, Basic/Digest/etcc). Or, better yet, try using something like Fiddler or Httpwatch to understand what is the authentication scheme used in the browser.
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    2. COAmitay, thanks. I actually tried it with and without that. I agree. It is totally redundant. I think fiddler is a great idea. I'll give it a shot.
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