如何保护Vb6应用程序和mssql服务器之间的连接？

Question

我正在使用一个遗留应用程序，它使用sqloledb提供程序和activex数据对象连接到mssql数据库。现在我需要在sql server中加密应用程序和服务器之间的连接而不使用强制加密选项。

我在sql server实例中安装了自签名证书，并尝试将Encrypt=true和Trustservercertificate=true放在连接字符串中。但是连接没有加密。

我尝试使用ODBC提供程序与ADO，并在使用encrypt=true和trustservercertificate=true时，我收到一个SSL安全错误，打开连接。

请告诉我如何使用ADO 2.8库建立安全连接。

Private Sub Command1_Click()
    Dim sConnectionString As String
    Dim strSQLStmt As String

     '-- Build the connection string
     'sConnectionString = "UID=userid;PWD=password;Initial Catalog=EHSC_SYM_Kings_Development;Server=EHILP-257MIB14;Provider=MSOLEDBSQL;Encrypt=YES;trustServerCertificate=YES"
     'sConnectionString = "Provider=sqloledb;Data Source=192.168.27.91MIB14;Initial Catalog=EHSC_SYM_Kings_Development;User Id=userid;Password=password;Encrypt=YES;trustServerCertificate=YES"
     'sConnectionString = "driver={SQL Server};server=192.168.27.91MIB14;user id=userid;password=password;Initial Catalog=EHSC_SYM_Kings_Development;Encrypt=Yes;trustServerCertificate=True"
     sConnectionString = "Provider=SQLNCLI11;Server=192.168.27.91MIB14;Database=EHSC_SYM_Kings_Development;Uid=userid;Pwd=password;Encrypt=yes;trustServerCertificate=True"

     strSQLStmt = "select * from dbo.patient where pat_pid = '1001'"

    'DB WORK
    Dim db As New ADODB.Connection
    Dim cmd As New ADODB.Command
    Dim rs As New ADODB.Recordset
    Dim result As String

    db.ConnectionString = sConnectionString
    db.Open 'open connection

    With cmd
      .ActiveConnection = db
      .CommandText = strSQLStmt
      .CommandType = adCmdText
    End With

    With rs
      .CursorType = adOpenStatic
      .CursorLocation = adUseClient
      .LockType = adLockOptimistic
      .Open cmd
    End With

    If rs.EOF = False Then
        rs.MoveFirst
        Let result = rs.Fields(0)
    End If
    'close conns
    rs.Close
    db.Close
    Set db = Nothing
    Set cmd = Nothing
    Set rs = Nothing
End Sub