Home Forums .NET libraries Xceed SFTP/FTP for .NET Timeout when calling GetFolderContents, however long the Timeout property value is

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    #21266 |


    I am connecting to a GlobalScape FTP server using port 990. The conenction is fine, but as soon as I try to list the folder contents the code stops and eventually times out. I have tried various settings for the Timeout property and none appear to work. I can connect to the server using FileZilla with no problems, but we have found before that DART’s SFTP components do not work against that server.

     It also fails if I set PassiveTransfer to True. However in that situation I get the following error:

    Xceed.Ftp.FtpIOException was unhandled
      Message=”An I/O error occurred while accepting the FTP server’s data connection.”
           at Xceed.Ftp.Engine.FtpCommandSequence.EndExecute(IAsyncResult asyncResult)
           at Xceed.Ftp.FtpClient.DoExecuteCommand(FtpCommandChannel commandChannel, BaseFtpCommand command)
           at Xceed.Ftp.FtpClient.DoGetFolderContents(FtpCommandChannel commandChannel, ListFtpCommand listCommand)
           at Xceed.Ftp.FtpClient.GetFolderContents(String remoteFileMask)
           at HSTFTPServiceTester.Form1.Button2_Click(Object sender, EventArgs e) in E:\Framework\Framework\BusinessObjects\HSTResults\HSTResultGateway\HSTFTPServiceTester\Form1.vb:line 108
           at System.Windows.Forms.Control.OnClick(EventArgs e)
           at System.Windows.Forms.Button.OnClick(EventArgs e)
           at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
           at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
           at System.Windows.Forms.Control.WndProc(Message& m)
           at System.Windows.Forms.ButtonBase.WndProc(Message& m)
           at System.Windows.Forms.Button.WndProc(Message& m)
           at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
           at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
           at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
           at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
           at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
           at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
           at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
           at System.Windows.Forms.Application.Run(ApplicationContext context)
           at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
           at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
           at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
           at HSTFTPServiceTester.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
           at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
           at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
           at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
           at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
           at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
           at System.Threading.ThreadHelper.ThreadStart()
      InnerException: System.Net.Sockets.SocketException
           Message=”No connection could be made because the target machine actively refused it ServerIP:3454″
                at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
                at Xceed.Ftp.Engine.PassiveFtpDataChannel.ConnectCompleted(IAsyncResult asyncResult)

    Can you help?

    Heres my code, slightly edited for security:

    Private WithEvents FTPClient As Xceed.Ftp.AsyncFtpClient

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

    Xceed.Ftp.Licenser.LicenseKey =

    “Valid licence key”

    FTPClient =

    New Xceed.Ftp.AsyncFtpClient

    FTPClient.TraceWriter =

    New IO.StreamWriter(“E:\XCeedFTP.log”, True)


    FTPClient.UseRemoteAddress =


    FTPClient.PassiveTransfer =


    FTPClient.Timeout = 90

    Dim VerificationFlags As Xceed.Ftp.VerificationFlags

    VerificationFlags = Xceed.Ftp.VerificationFlags.IgnoreInvalidBasicConstraints

    FTPClient.Connect(“ServerIP”, “990”, Xceed.Ftp.AuthenticationMethod.Tls, _




    “UserName”, “Password”)

    Dim LocalFilename As String = “E:\Downloads\XceedDownload.txt”

    If IO.File.Exists(LocalFilename) Then IO.File.Delete(LocalFilename)

    ‘Get a list of a folders contents



    Dim x As Xceed.Ftp.FtpItemInfoList = FTPClient.GetFolderContents(“*.*”)

    ‘Get a file




    “/From_Pro/2009.09.29.dnl”, LocalFilename)

    End Sub

    Private Sub FTPClient_CertificateReceived(ByVal sender As Object, ByVal e As Xceed.Ftp.CertificateReceivedEventArgs) Handles FTPClient.CertificateReceived

    If e.ServerCertificate.Thumbprint = “Valid thumb print here” Then

    e.Action = Xceed.Ftp.VerificationAction.Accept

    End If

    End Sub



    The Trace file output is:

    Connected to ServerIP:990 on 01/10/2009 @ 10:02:21
    < 220 Prometric Secure FTP Server
    > PBSZ 0
    < 200 PBSZ Command OK. Protection buffer size set to 0.
    > PROT P
    < 200 PROT Command OK. Using Private data connection
    > USER UserName
    < 331 Password required for UserName.
    > PASS *****
    < 230-WARNING: You are entering a restricted system.  All data and information herein may be considered as confidential and is proprietary to XX. 
    < 230-Please ensure you have the proper authorization before proceeding.  Activity on this system is subject to monitoring for unauthorized access. 
    < 230-Where such monitoring reveals unauthorized access or use, XX shall invoke all applicable rights to investigate and prosecute violators through subsequent civil and/or
    < 230-criminal proceedings.
    < 230-Welcome to the XX Private FTP Server.
    < 230 If you experience any difficulties with this service, please contact your Program Manager at XX.
    > CWD /From_Pro
    < 250 Folder changed to “/From_Pro”.
    > TYPE A
    < 200 Type set to A.
    > PORT 192,168,254,131,6,189
    < 200 Command okay.
    > LIST *.*

    Applies to Xceed FTP for .NET. Imported from legacy forums. Posted by Robert (had 2585 views)

    Diane [Xceed]
    Post count: 1353

    Hi Robert,

    We recently corrected a timeout problem in FTP for .NET, it was included in the service release of September 11th 2008 (General package 3.2.9460.14460).

    Please make sure that you are using the latest version of the DLL:

    If you are still having issues, we would need a sample project which reproduces the issue in order to investigate further. You can send it to support@xceed.com (please include a link to this forums thread as a reference).


    Applies to Xceed FTP for .NET. Imported from legacy forums. Posted by Diane [Xceed] (had 1531 views)

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