VB。NET：请求被中止：无法创建 SSL/TLS 安全通道

VB. NET: The request was aborted: Could not create SSL/TLS secure channel

提问by wysiwyg327

I have an application coded in VB.net that has this method of accessing Webservice, i have this error and after searching fixes i still have no luck.

我有一个在 VB.net 中编码的应用程序，它具有这种访问 Web 服务的方法，我遇到了这个错误，在搜索修复程序后我仍然没有运气。

Error: The request was aborted: Could not create SSL/TLS secure channel.

错误：请求被中止：无法创建 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

This is my code and I'm using VS2015 and Windows 10.

这是我的代码，我使用的是 VS2015 和 Windows 10。

All help are really appreciated. TIA

非常感谢所有帮助。TIA

回答by MatSnow

Obviously the URL you're calling requires TLS 1.1or TLS 1.2.

显然，您正在调用的 URL 需要TLS 1.1或TLS 1.2。

You can enable TLS 1.1or TLS 1.2by setting the security-protocol with ServicePointManager.SecurityProtocol:

您可以启用TLS 1.1或TLS 1.2通过设置安全协议ServicePointManager.SecurityProtocol：

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12

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

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

.NET 4.0支持高达TLS 1.0while.NET 4.5或更高 支持高达TLS 1.2
参考：

• .NET 4.5 中的默认安全协议
• 是否有 TLS 1.2 的 .NET 实现？