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

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1. Supply the credentials of the Currently Logged on User to the Proxy object similar to this:

// Begin code change by jeff                     //  Obtain the ‘Proxy‘ of the  Default browser.                     IWebProxy theProxy = aReq.Proxy;                    // Print the Proxy Url to the console.                    if (theProxy != null)                    {// Use the default credentials of the logged on user.                        theProxy.Credentials = CredentialCache.DefaultCredentials;                    }                    // End code change by jeff                     HttpWebResponse aResp = aReq.GetResponse() as HttpWebResponse;

　　2. Add this property to the <<application>>.exe.config or machine.config file:

<system.net>    <defaultProxy useDefaultCredentials="true"> </defaultProxy></system.net>

　　link:http://blogs.msdn.com/b/jpsanders/archive/2009/03/24/httpwebrequest-webexcepton-the-remote-server-returned-an-error-407-proxy-authentication-required.aspx

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