System.Net.WebClient基础连接已关闭

Question

基础连接已关闭：连接被意外关闭

我使用Web客户端时收到错误消息。我已经用asp代码测试过了，它运行得很好。但是当我尝试运行exe版本的代码时，它运行以下错误，并且我能够从服务器访问请求地址，并且它位于内部网络中。

我的服务器设置： - 的Windows Server 2003 SP2 Entrerprise asp.net 2.0.50727 IIS V6.0

下面是一些代码：

手动访问

protected static String cross_server_req(String strContent, String strPage, String strPrivateKey) 
    { 
     try 
     { 
      WebClient wc = new WebClient(); 
      String strURL = SERVICE_PATH + strPage + "?r=" + DES_.DESEncrypt(strContent); 
      byte[] responseArray = wc.DownloadData(strURL); 
      String strResData = Encoding.UTF8.GetString(responseArray); 
      if (Config.RecordWebService == "1") 
      { 
       String strLogContent = "Request:" + strContent + "\r\nResponse:" + strResData + "\r\nDateCreated:" + D_Time.DNow + "\r\n\r\n"; 
       ServiceLog.Logger(strPage, strLogContent); 
      } 
      if (null != strResData && String.Empty != strResData) 
      { 
       return strResData.Trim(); 
      } 
     } 
     catch (Exception ex) 
     { 
      ServiceLog.Logger("cross_server_req() Exception:" + ex.Message + "\r\n" + ex.StackTrace); 
     } 
     return null; 
    } 

这里是从日志

cross_server_req() Exception:The underlying connection was closed: The connection was closed unexpectedly. 
at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request) 
at System.Net.WebClient.DownloadData(Uri address) 
at System.Net.WebClient.DownloadData(String address) 
at Account.cross_server_request_curl(String strContent, String strPage, String strPrivateKey) 

请让我知道任何建议，帮助这个问题？我查看了该网站，并找不到解决方案。

Answer 1

我相信这个错误可能与TLS/SSL连接有关，假设您点击一个HTTPS网址。看看this thread。基本上你需要提供一些代码来验证证书是否有效。对于有指纹问题或不完全信任的CA，这是需要的。希望这有助于解决您的问题。

System.Net.ServicePointManager.ServerCertificateValidationCallback += new System.Net.Security.RemoteCertificateValidationCallback(validateSSLCert); 


private static bool validateSSLCert(object sender, X509Certificate cert, X509Chain chain, System.Net.Security.SslPolicyErrors error) 
{ 
    return true; 
}