未处理的“System.Net.WebException”类型的异常出现在 System.dll 中 基础连接已经关闭: 连接被意外关闭
错误如标题：
代码如下：每当运行到红色代码处就出错了。
public static bool GetLogin(string userName, string password)
{
bool result = false;
GetInitialCookies(userName);
Thread.Sleep(1000*5);

Encoding encoding = System.Text.Encoding.GetEncoding("gb2312");

string postUrl = "https://passport.baidu.com/?login";
StringBuilder postString = new StringBuilder();
postString.Append("tpl_ok=");
postString.Append("&next_target=");
postString.Append("&tpl=");
postString.Append("&skip_ok=");
postString.Append("&aid=");
postString.Append("&need_pay=");
postString.Append("&need_coin=");
postString.Append("&pay_method=");
postString.Append("&u=.%2F");
postString.Append("&return_method=get");
postString.Append("&more_param=");
postString.Append("&return_type=");
postString.Append("&psp_tt=0");
postString.Append("&password=" + HttpUtility.UrlEncode(password,encoding));
postString.Append("&safeflg=0");
postString.Append("&username=" +HttpUtility.UrlEncode(userName,encoding));
postString.Append("&verifycode=");
postString.Append("&mem_pass=on");//记住密码

byte[] postBytes = encoding.GetBytes(postString.ToString());

HttpWebRequest request = (HttpWebRequest) HttpWebRequest.Create(postUrl);
request.Method = "POST";
request.Timeout = 1000*60;
request.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, */*";
request.Referer = "http://passport.baidu.com/center";
request.Headers.Add("Accept-Language", "zh-cn,zh;q=0.5");
request.Headers.Add("Accept-Charset", "gb2312,utf-8;q=0.7,*;q=0.7");
request.ContentType = "application/x-www-form-urlencoded";
request.Headers.Add("Accept-Encoding", "gzip, deflate");
//request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727)";
request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.2; zh-CN; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6";
request.KeepAlive = true;
//request.Headers.Add("Host", "passport.baidu.com");
//request.Headers[HttpRequestHeader.Host] = "passport.baidu.com ";
request.Headers.Add("Cache-Control", "no-cache");
request.ContentLength = postBytes.Length;
request.AllowAutoRedirect = false;
//request.CookieContainer.Add()


System.Net.ServicePointManager.CertificatePolicy = new TrustAllCertificatePolicy();

request.CookieContainer = BlogCookies;

using (Stream reqStream = request.GetRequestStream())
{
reqStream.Write(postBytes, 0, postBytes.Length);

}

HttpWebResponse response = (HttpWebResponse)request.GetResponse();//response.Headers.Add("P3P", "CP=CAO PSA OUR");

BlogCookies.Add(response.Cookies);

StreamReader respStream = new StreamReader(response.GetResponseStream(), encoding);
string resutlContent = respStream.ReadToEnd();
respStream.Close();
response.Close();
FileUtility.Log("baidu：通过用户名和密码实现登录");
if(resutlContent.IndexOf("location.href=url;")>0)
{
FileUtility.Log("baidu：登录成功");
result = true;

#region 把登录成功后获得的cookies写到文件中
string _cookiesStr = string.Empty;
CookieCollection _cookies = response.Cookies;
foreach (Cookie _cookie in _cookies)

{
_cookiesStr += _cookie.Name + "=" + _cookie.Value + ";";
}
//FileUtility.WriteFile("Cookies", "baidu_" + userName, _cookiesStr);
FileUtility.WriteFile("Cookies", "baidu_" + userName + ".txt", BlogCookies.GetCookieHeader(new Uri("http://passport.baidu.com/center")));
#endregion
}
else
{
result = false;
FileUtility.Log("baidu：登录失败");
}
return result;
}

[解决办法]
http连接已经断开所以request.GetResponse()就出现异常了
[解决办法]
没有取到. 超时了吧.
[解决办法]
request可能没有实际的值
[解决办法]
你构造的httpRequest不正确.http发送后连接所以断开了
[解决办法]
额``我也遇到同样的问题了` `
是上传图片的时候来着,
我说各位大哥们,你们能不能给点实际的建议额``
只是说这个有问题那个有问题` `
说下具体怎么做行不``
[解决办法]
我怀疑是你的网络环境的影响。
看你的代码里还用了代理，你尝试着在一个没有代理服务器上网的环境里试下。
我以前也做过类似的功能，但是仅仅遇到过乱码的问题而已。然后解决了呵呵。。
你好好调试下。
[解决办法]
还有就是确保，你发送请求的服务地址是处于活动的状态。
如果你请求的服务地址关闭的话，是得不到响应的。
[解决办法]
try catch 输出详细错误信息
到事件查看器中去看下错误日志
[解决办法]
把这一句保护起来！

C# code

HttpWebResponse response = (HttpWebResponse)request.GetResponse();
[解决办法]
换个环境试下，不一定是你code问题，其他域名能正常获得，证明该域名问题