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.NET Development
.NET Framework 3.5
FtpWebRequest Class
 EnableSsl Property
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This page is specific to
Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:
.NET Framework Class Library
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)
Visual Basic (Declaration)
Public Property EnableSsl As Boolean
Visual Basic (Usage)
Dim instance As FtpWebRequest
Dim value As Boolean

value = instance.EnableSsl

instance.EnableSsl = value
C#
public bool EnableSsl { get; set; }
Visual C++
public:
property bool EnableSsl {
    bool get ();
    void set (bool value);
}
JScript
public function get EnableSsl () : boolean
public function set EnableSsl (value : boolean)

Property Value

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

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.

C#
public static bool ListFilesOnServerSsl(Uri serverUri)
{
    // The serverUri should start with the ftp:// scheme.
    if (serverUri.Scheme != Uri.UriSchemeFtp)
    {
        return false;
    }
    // Get the object used to communicate with the server.
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverUri);
    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.

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

    FtpWebResponse response = (FtpWebResponse) request.GetResponse();
     Console.WriteLine("The content length is {0}", response.ContentLength);
    // The following streams are used to read the data returned from the server.
    Stream responseStream = null;
    StreamReader readStream = null;
    try
    {
        responseStream = response.GetResponseStream(); 
        readStream = new StreamReader(responseStream, System.Text.Encoding.UTF8);

        if (readStream != null)
        {
            // Display the data received from the server.
            Console.WriteLine(readStream.ReadToEnd());
        } 
        Console.WriteLine("List status: {0}",response.StatusDescription);            
    }
    finally
    {
        if (readStream != null)
        {
            readStream.Close();
        }
        if (response != null)
        {
            response.Close();
        }
    }


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

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

    Console.WriteLine("Exit message: {0}", 
        response.ExitMessage);
    return true;
}

Visual C++
static bool ListFilesOnServerSsl( Uri^ serverUri )
{
   // The serverUri should start with the ftp:// scheme.
   if ( serverUri->Scheme != Uri::UriSchemeFtp )
   {
      return false;
   }

   // Get the object used to communicate with the server.
   FtpWebRequest^ request = dynamic_cast<FtpWebRequest^>(WebRequest::Create( serverUri ));
   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.
   ServicePoint^ sp = request->ServicePoint;
   Console::WriteLine( "ServicePoint connections = {0}.", sp->ConnectionLimit );
   sp->ConnectionLimit = 1;
   FtpWebResponse^ response = dynamic_cast<FtpWebResponse^>(request->GetResponse());
   Console::WriteLine( "The content length is {0}", response->ContentLength );

   // The following streams are used to read the data returned from the server.
   Stream^ responseStream = nullptr;
   StreamReader^ readStream = nullptr;
   responseStream = response->GetResponseStream();
   readStream = gcnew StreamReader( responseStream,System::Text::Encoding::UTF8 );

   // Display the data received from the server.
   Console::WriteLine( readStream->ReadToEnd() );
   Console::WriteLine( "List status: {0}", response->StatusDescription );
   readStream->Close();
   response->Close();

   Console::WriteLine( "Banner message: {0}", response->BannerMessage );

   Console::WriteLine( "Welcome message: {0}", response->WelcomeMessage );

   Console::WriteLine( "Exit message: {0}", response->ExitMessage );

   return true;
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0
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"Unable to connect to the remote server" when using FTP over SSL      belayon   |   Edit   |   Show History

I have tried the using EnableSsl property as shown in the code sample above and cannot successfully connect to an FTP server over SSL. I am able to connect to the same server using WS_FTP as a client with the SFTP/SSH option on the connection.

Any suggestions out there? Seems alot of other folks are having the same issue and there are not too many good solutions offered in the public chats.

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"Unable to connect to the remote server" when using FTP over SSL      eldaguillodekuliakan   |   Edit   |   Show History
look sftp/ssh is a diferent protocol looking for de ftps/ssl option on your ftp server
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