Proxy Authentication Error

Question

HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create("https://www.example.com");
NetworkCredential nc = new NetworkCredential("myname", "mypass");
WebProxy myproxy = new WebProxy("192.168.1.1:8080", false);
myHttpWebRequest.Proxy = myproxy;
myHttpWebRequest.Proxy = WebRequest.DefaultWebProxy;
myHttpWebRequest.Method = "GET";

HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
MessageBox.Show("Ok");

I'm using this code to connect with a website (C#.net desktop application). But I'm having this error message:

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

How can i fix this?

Do you need to pass nc into the WebProxy constructor?

spb
– spb

2011-11-22 07:36:23 +00:00
Commented Nov 22, 2011 at 7:36 — spb
– spb, Commented Nov 22, 2011 at 7:36

user7116 · Accepted Answer · 2011-11-22 08:15:12Z

2

You're currently not using the credentials in the proxy. Here is an example adapted from MSDN of how to use your NetworkCredential:

class Downloader
{
    static void Main(string[] args)
    {
        NetworkCredential nc = new NetworkCredential(args[0], args[1]);
        WebProxy proxy = new WebProxy(args[2], false);
        proxy.Credentials = nc;

        WebRequest request = new WebRequest(args[3]);
        request.Proxy = proxy;
        using (WebResponse response = request.GetResponse())
        {
            Console.WriteLine(
                @"{0} - {1} bytes",
                response.ContentType,
                response.ContentLength);
        }
    }
}

When I compiled and ran this complete example:

C:\cs>csc proxy.cs
Microsoft (R) Visual C# 2010 Compiler version 4.0.30319.1
Copyright (C) Microsoft Corporation. All rights reserved.


C:\cs>proxy user pass http://proxy:80 http://www.google.com
text/html; charset=ISO-8859-1 - 31398 bytes

C:\cs>

_{Of course I used my actual user/pass and proxy for my work account.}

edited Nov 22, 2011 at 8:15

answered Nov 22, 2011 at 7:36

user7116

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11 Comments

abatishchev Over a year ago

Why do you use CredentialCache+NetworkCredential instead of just NetworkCredential?

user7116 Over a year ago

Because I adapted it from the wrong example initially. Corrected, thank you.

abatishchev Over a year ago

@six: btw, that was not a pestering, but a curiosity :)

Kevin Over a year ago

how im having this error message Invalid URI: The URI scheme is not valid. I have credentials for proxy and as well as username and password for the website i need to be logged in

user7116 Over a year ago

@Kevin: you likely need to prepend http:// to the proxy URI. I've done so in my example.

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