Only changing from a normal connection to a secure connectio

Question

Hey
i'm using to connect over SSL using the following code

    Dim host As String = "host"
        Dim user As String = "user"
        Dim password As String = "password"
        Logger.CurrentLevel = Level.ALL
        Dim ftp As ProFTPClient = Nothing
        ' Try
        log.Info("Connecting")

        ftp = New ProFTPClient
        ftp.RemoteHost = host
        ftp.ServerValidation = ProFTPClient.ServerValidationType.None
        'Dim cert As ProFTPCertificate = ProFTPCertificate.CreateFromCER_PVK("C:\certificate\bin\testing.cert", "C:\certificate\bin\testing.pvk", "test")
        ftp.IsImplicitFTPS = True
        ftp.ServerCompatibility = ProFTPClient.CompatibilityFlags.DisableDataSSLClosure
        ftp.ServerValidation = ProFTPClient.ServerValidationType.None
        ftp.Connect()
        ftp.Auth()
        ftp.Login(user, password)
        ftp.ConnectMode = EnterpriseDT.Net.Ftp.FTPConnectMode.PASV
        ftp.TransferType = EnterpriseDT.Net.Ftp.FTPTransferType.BINARY
        'Response.Write("Directory before put:")
        Dim files As Array = ftp.Dir(".", True)

Everything is fine and the connection is established, however when the execution reaches the last line 'Dim files As Array = ftp.Dir(".", True)'

I got the following error:

Only changing from a normal connection to a secure connection is supported.

can you tell me why?

Answer 1

Can you post the log file please?

Everything is fine and the connection is established, however when the execution reaches the last line 'Dim files As Array = ftp.Dir(".", True)'

I got the following error:

Only changing from a normal connection to a secure connection is supported.

can you tell me why?

Answer 2

I don't know where is the log file located, but the "LastValidReply" I got before calling the

files As Array = ftp.Dir(".", True)' 

is

ftp.LastValidReply
{EnterpriseDT.Net.Ftp.FTPReply}
    ReplyCode: "200"
    ReplyData: Nothing
    ReplyText: "Type set to A." 

Answer 3

again here is the piece of code

 FTP.RemoteHost = host
        FTP.IsImplicitFTPS = True
        FTP.ServerCompatibility = ProFTPClient.CompatibilityFlags.DisableDataSSLClosure
        FTP.ServerValidation = ProFTPClient.ServerValidationType.None
        FTP.Connect()
        FTP.Auth()
        FTP.Login(user, password)
        FTP.ConnectMode = FTPConnectMode.PASV
        FTP.TransferType = FTPTransferType.ASCII


        Try
            Dim files As Array = FTP.Dir(".", True)
            Dim i As Integer = 0
            While i < files.Length
                Response.Write(files(i) & "<BR><BR><BR>")
                i += 1
            End While
        Catch ex As Exception
            Response.Write("ERROR" & ex.Message & "<BR>")
        End Try

i've catched CommandSent and ReplyRecieved to capture FTP messages and I got the following

---> PBSZ 0
200 PBSZ=0
---> PROT P
200 PROT command successful.
---> USER dmpuser
331 Password required for dmpuser.
---> PASS ********
230 User dmpuser logged in.
---> TYPE A
200 Type set to A.
---> PASV
227 Entering Passive Mode (10,1,21,49,98,235)
ERROR Only changing from a normal connection to a secure connection is supported.

can you tell me what's wrong?
thanks

Answer 4

When I changed FTP.ConnectMode = [code]FTPConnectMode.Passive[code] to [code]FTP.ConnectMode = FTPConnectMode.ACTIVE[/code] everything works fine, so is it required that implicit SSL is active connection and can't be Passing?

Answer 5

When I changed FTP.ConnectMode =

FTPConnectMode.Passive

to

FTP.ConnectMode = FTPConnectMode.ACTIVE

everything works fine, so is it required that implicit SSL is active connection and can't be Passing?

Answer 6

Is it possible that there is a firewall blocking passive connections? This is often the case.

When I changed FTP.ConnectMode =

FTPConnectMode.Passive

to

FTP.ConnectMode = FTPConnectMode.ACTIVE

everything works fine, so is it required that implicit SSL is active connection and can't be Passing?

Answer 7

I have windows XP and i've disabled the firewall, note that the server and the client application are both on the same machine. is there other possibilities?

Answer 8

Also Passive mode is working with explicit SSL but not with implicit SSL