VB。 NET：請求已中止：無法創建SSL/TLS安全通道

Question

我在VB.net編碼的應用程序，它具有訪問web服務的這種方法，我有這個錯誤和搜索修復後，我仍然沒有運氣。

錯誤： 請求已中止：無法創建SSL/TLS安全通道。

'ServicePointManager.Expect100Continue = False 
    'ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls 

    Dim request As HttpWebRequest = DirectCast(WebRequest.Create(url), HttpWebRequest) 

    Dim ErrMsg As String = String.Empty 

    Try 

     Dim response As WebResponse = request.GetResponse() 

     Using responseStream As Stream = response.GetResponseStream() 
      Dim reader As New StreamReader(responseStream, Encoding.UTF8) 

      Return reader.ReadToEnd() 
     End Using 
    Catch ex As WebException 

     ErrMsg = ex.Message.ToString 
     MsgBox(ErrMsg) 

     Dim errorResponse As WebResponse = ex.Response 
     Using responseStream As Stream = errorResponse.GetResponseStream() 
      Dim reader As New StreamReader(responseStream, Encoding.GetEncoding("utf-8")) 
      ' log errorText 
      Dim errorText As [String] = reader.ReadToEnd() 
     End Using 
     Throw 
    End Try 

這是我的代碼，我使用VS2015和Windows 10

所有幫助真的讚賞。 TIA

Answer 1

很明顯，您要撥打的網址需要TLS 1.1或TLS 1.2。

您可以通過ServicePointManager.SecurityProtocol設置安全協議使TLS 1.1或TLS 1.2：

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 

.NET 4.0 supports up to TLS 1.0 while .NET 4.5 or higher supports up to TLS 1.2
For reference:

• Default SecurityProtocol in .NET 4.5
• Are there .NET implementation of TLS 1.2?