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FtpWebRequest.EnableSsl Property

Gets or sets a Boolean that specifies that an SSL connection should be used.

Namespace:  System.Net
Assembly:  System (in System.dll)

Public Property EnableSsl As Boolean

Property Value

Type: System.Boolean
true if control and data transmissions are encrypted; otherwise, false. The default value is false.


The connection to the FTP server has already been established.

Caution noteCaution

Unless the EnableSsl property is true, all data and commands, including your user name and password information, are sent to the server in clear text. Anyone monitoring network traffic can view your credentials and use them to connect to the server. If you are connecting to an FTP server that requires credentials and supports SSL, you should set EnableSsl to true.

The "AUTH TLS" command is sent to the server to request an encrypted session. If the server does not recognize this command, you receive a WebException exception.

The following code example uses an encrypted connection to download the directory listing from an FTP server.

        Public Shared Function ListFilesOnServerSsl(ByVal serverUri As Uri) As Boolean
            ' The serverUri should start with the ftp:// scheme.
            If serverUri.Scheme <> Uri.UriSchemeFtp Then
                Return False
            End If
            ' Get the object used to communicate with the server.
            Dim request As FtpWebRequest = CType(WebRequest.Create(serverUri), FtpWebRequest)
            request.Method = WebRequestMethods.Ftp.ListDirectory
            request.EnableSsl = True

            ' Get the ServicePoint object used for this request, and limit it to one connection.
            ' In a real-world application you might use the default number of connections (2),
            ' or select a value that works best for your application.

            Dim sp As ServicePoint = request.ServicePoint
            Console.WriteLine("ServicePoint connections = {0}.", sp.ConnectionLimit)
            sp.ConnectionLimit = 1

            Dim response As FtpWebResponse = CType(request.GetResponse(), FtpWebResponse)
            Console.WriteLine("The content length is {0}", response.ContentLength)
            ' The following streams are used to read the data returned from the server.
            Dim responseStream As Stream = Nothing
            Dim readStream As StreamReader = Nothing
                responseStream = response.GetResponseStream()
                readStream = New StreamReader(responseStream, Encoding.UTF8)

                If readStream IsNot Nothing Then
                    ' Display the data received from the server.
                End If
                Console.WriteLine("List status: {0}", response.StatusDescription)
                If readStream IsNot Nothing Then
                End If
                If response IsNot Nothing Then
                End If
            End Try

            Console.WriteLine("Banner message: {0}", response.BannerMessage)

            Console.WriteLine("Welcome message: {0}", response.WelcomeMessage)

            Console.WriteLine("Exit message: {0}", response.ExitMessage)
            Return True
        End Function

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.