Cannot connect to url in C# with 401 unauthorized error

Question

I'm looking to get the content of a page from

http://12.18.60.199:81 

I'm using my corporate network and if I use internet explorer, it prompts for username and password, I type that in and I get the content of the page. I need to do this in C#, but have no luck for the past few hours:

Uri requestUri = null;
Uri.TryCreate("http://12.18.60.199:81", UriKind.Absolute, out requestUri);

NetworkCredential nc = new NetworkCredential(@"username", @"password", "domain");
CredentialCache cache = new CredentialCache();
cache.Add(requestUri, "Basic", nc); //also tried "Anonymous", "Basic", "Digest",  "Dpa", 
                                 //"External", "Kerberos", "Msn", "Negotiate", "Ntlm", "Sicily" 

using (WebClient client = new WebClient())
{
   client.Credentials = cache;
   using (Stream stream = client.OpenRead("http://12.18.60.199:81"))
   using (StreamReader reader = new StreamReader(stream))
   {
      //stuff
   }
}

Keep getting 401 unauthorized, invalid credentials, help!

If I substitute the above address with http://google.com, it'll work, so the code works... username and password have been tested to work in broswer

Answer 1

If you are connecting through a proxy server try adding in your proxy and pass the credentials. For example:

// Prepare web request...
HttpWebRequest myRequest =
   (HttpWebRequest)WebRequest.Create("http://www.test.com");
// proxy details
myRequest.Proxy = new WebProxy("http://10.0.0.1", true);
myRequest.Proxy.Credentials = new NetworkCredential("test", "password", "domain");

Answer 2

I had same issue, and found workaround to add Authorization request header. I've used fiddler to get that base64. Never found proper solution, as you all know temp solutions are long-lasting in out world :)

service.Url = "http://127.0.0.1/";
service.SetRequestHeader("Authorization", "Basic dW8sX3NvYXB6SjRma2pzdXZqNDg5ZA==");            
service.PreAuthenticate = true;