vb.net - SSL TLS 1.2 channel 创建 VB.net HTTPS WebRequest

Question

我有一个遗留的 Visual Studio 2010 vb.net 应用程序，我需要更新 SSL TLS channel 以支持 TLS 1.2。我尝试了几个不同的选项(请参阅尝试的注释代码)，但都导致我遇到相同的错误，“无法创建 SSL/TLS 安全通道。”我错过了什么？

Public Shared Function processCCRequest(ByVal strRequest As String) As String
    'declare the web request object and set its path to the PayTrace API

    Dim ThisRequest As WebRequest = WebRequest.Create("https://beta.paytrace.com/api/default.pay")
    'configure web request object attributes
    ThisRequest.ContentType = "application/x-www-form-urlencoded"
    ThisRequest.Method = "POST"

    'encode the request
    Dim Encoder As New System.Text.ASCIIEncoding
    Dim BytesToSend As Byte() = Encoder.GetBytes(strRequest)

    'declare the text stream and send the request to PayTrace's API
    Dim StreamToSend As Stream = ThisRequest.GetRequestStream
    StreamToSend.Write(BytesToSend, 0, BytesToSend.Length)
    StreamToSend.Close()

    ''ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
    ''allows for validation of SSL conversations
    ''ServicePointManager.ServerCertificateValidationCallback = New System.Net.Security.RemoteCertificateValidationCallback(AddressOf)
    ServicePointManager.Expect100Continue = True
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
    System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
     ''| SecurityProtocolType.Tls11 | SecurityProtocolType.Tls
    ''var(response = WebRequest.Create("https://www.howsmyssl.com/").GetResponse())
    ''var(body = New StreamReader(response.GetResponseStream()).ReadToEnd())


    'Catch the response from the webrequest object
    Dim TheirResponse As HttpWebResponse = ThisRequest.GetResponse

    Dim sr As New StreamReader(TheirResponse.GetResponseStream)
    Dim strResponse As String = sr.ReadToEnd

    'Out put the string to a message box - application should parse the request instead
    ' MsgBox(strResponse)

    sr.Close()
    Return strResponse
End Function

提前感谢您的建议!

Answer 1

如果您使用的是 .net 3.5，请使用此脚本

ServicePointManager.SecurityProtocol = DirectCast(3072, SecurityProtocolType)