远程服务器返回错误：（407）需要代理身份验证

本文介绍了远程服务器返回错误：（407）需要代理身份验证的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我将此代码与.NET 3.5结合使用，并收到错误远程服务器返回错误：（407）需要代理身份验证。

I use this code with .NET 3.5 and receive error "The remote server returned an error: (407) Proxy Authentication Required."

using (WebClient client = new WebClient()) { WebRequest.DefaultWebProxy.Credentials = CredentialCache.DefaultCredentials; try { string webPageStr = client.DownloadString(URL); Console.WriteLine("OK"); } catch (Exception ex) { Console.WriteLine("FAIL"); Console.WriteLine(ex.Message); } }

但是，此代码可与.NET 4.0一起顺利使用此行足以通过代理身份验证，而不适用于.NET 3.5。

However, this code works smoothly with .NET 4.0 as this line is sufficient to pass the proxy authentication while it is not for .NET 3.5.

WebRequest.DefaultWebProxy.Credentials = CredentialCache.DefaultCredentials;

因此，我尝试了许多其他方法来解决此问题，但没有一种有效：

Therefore, I tried many other ways to solve this problem but none of them works:

1）将CredentialCache.DefaultCredentials行替换为

1) Replace CredentialCache.DefaultCredentials line with

WebRequest.DefaultWebProxy.Credentials = new NetworkCredential(user, password, domain);

2）创建新的代理对象

2) Create new proxy object

IWebProxy proxy = new WebProxy(proxyUrl, port); proxy.Credentials = new NetworkCredential(user, pass, domain); client.Proxy = proxy; client.Credentials = new NetworkCredential(user, pass, domain);

3）添加此行

client.UseDefaultCredentials = true;

4）使用HttpWebRequest代替WebClient并重复上述每个过程。这是示例代码。

4) Use HttpWebRequest instead of WebClient and repeat every procedure above. This is sample code.

HttpWebRequest webRequest = WebRequest.Create(URL) as HttpWebRequest; webRequest.Proxy = WebRequest.DefaultWebProxy; webRequest.Credentials = new NetworkCredential(user, pass, domain); webRequest.Proxy.Credentials = new NetworkCredential(user, pass, domain); try { webRequest.GetResponse(); Console.WriteLine("OK"); } catch (Exception ex) { Console.WriteLine("FAIL"); Console.WriteLine(ex.Message); }

我觉得自己走到了穷途末路，因为必须使用.NET 3.5。我不知道的这两个.NET版本之间一定有区别。

I feel like I come to a dead end as I have to use .NET 3.5. There must be difference between these two .NET versions that I do not know. Thank you very much in advance.

推荐答案

只需将其添加到配置中

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