vb.net - VB。净 : The request was aborted: Could not create SSL/TLS secure channel

Question

我有一个用 VB.net 编码的应用程序，它有这种访问 Web 服务的方法，我有这个错误，在搜索修复后我仍然没有运气。

错误:
请求被中止:无法创建 SSL/TLS 安全 channel 。

    '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

这是我的代码，我使用的是 VS2015 和 Windows 10。

非常感谢所有帮助。 TIA

Answer 1

显然，您调用的 URL 需要 TLS 1.1或 TLS 1.2 .

您可以启用 TLS 1.1或 TLS 1.2通过使用 ServicePointManager.SecurityProtocol 设置安全协议(protocol):

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?