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SimpleSFTPClient KeepAlivePeriod issue

Posted: 12/05/2008 15:51:27
by Kory Sarnelli (Standard support level)
Joined: 12/05/2008
Posts: 10

I recently added a 60000ms KeepAlivePeriod to a SimpleSFTPClient object and now it seems as though when I close my application it has to wait until the keepalive interval is complete. Is there any way around this? I am closing the sftp connection but it seems that the KeepAlive thread must still be running.
Posted: 12/06/2008 09:26:14
by Kory Sarnelli (Standard support level)
Joined: 12/05/2008
Posts: 10

I also have another (much more simple) question: What unit is the ElSimpleSFTPClient.SocketTimeout property defined in? Seconds, milliseconds? It doesn't say in the help. Thanks!
Posted: 12/06/2008 09:50:07
by Eugene Mayevski (Team)

All time intervals are in milliseconds.
As for the original question - the timer is stopped in Close method and in destructor. If you are using .NET edition, you might need to explicitly call Dispose method.

Sincerely yours
Eugene Mayevski
Posted: 12/06/2008 13:32:38
by Kory Sarnelli (Standard support level)
Joined: 12/05/2008
Posts: 10

Yes, I'm using the .NET edition.

I tried calling the Dispose method - I get the same results with an additional error after the delay:

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
at SBSftp.TElSftpClient.GetActive()
at SBSftp.TElSftpClient.get_Active()
at SBSimpleSftp.TElSimpleSFTPClient.GetActive()
at SBSimpleSftp.TElSimpleSFTPClient.get_Active()
at SBSimpleSftp.TElSimpleSFTPClient.DoSendKeepAlive(Object Sender)
at SBTimer.TElTimer.HandleTimerEvent(Object Sender)
at SBTimer.TTimerThread.DoTimer()
at SBTimer.TTimerThread.Execute()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
Posted: 12/06/2008 13:44:27
by Mykola Olshevsky (Basic support level)
Joined: 07/07/2005
Posts: 442

As Eugene wrote, timer is automatically disabled and destroyed in TElSimpleSftpClient.Close() method and destructor.
Are you calling the Close method?
And, also, are you using the latest build?
Posted: 12/06/2008 13:53:20
by Kory Sarnelli (Standard support level)
Joined: 12/05/2008
Posts: 10

Yes, using the latest build. I wrote a quick console app to demonstrate the issue (vb.net 2005):

Imports SBSftpCommon
Imports SBSimpleSftp

Module Module1

    '---------- sftp component methods----------------------
    Private Sub sftp_OnKeyValidate(ByVal Sender As Object, ByVal ServerKey As SBSSHKeyStorage.TElSSHKey, ByRef Validate As Boolean)
        Validate = True 'just a test app, no need to validate
    End Sub

    Private Sub sftp_OnAuthenticationStart(ByVal Sender As Object, ByVal SupportedAuths As Integer)
    End Sub

    Private Sub sftp_OnAuthenticationFailed(ByVal Sender As Object, ByVal AuthenticationType As Integer)
        Console.WriteLine("Authentication failed!")
    End Sub

    Private Sub sftp_OnAuthenticationSuccess(ByVal Sender As Object)
        Console.WriteLine("Authentication successful.")
    End Sub

    Private Sub sftp_OnError(ByVal Sender As Object, ByVal ErrorCode As Integer)
        Console.WriteLine("SFTP error: " + ErrorCode.ToString())
    End Sub
    '--------------/sftp comonent methods----------------------

    Sub Main()

        'connect to sftp server
        Dim sftp As New TElSimpleSFTPClient
        sftp.Address = ""
        sftp.Port = 22
        sftp.Username = "test"
        sftp.Password = "test123"
        sftp.KeepAlivePeriod = 10000
        sftp.AuthenticationTypes = 4 'password only
        AddHandler sftp.OnKeyValidate, AddressOf sftp_OnKeyValidate 'handle the key validation/fingerprint checking
        AddHandler sftp.OnAuthenticationStart, AddressOf sftp_OnAuthenticationStart 'successful authentication
        AddHandler sftp.OnAuthenticationSuccess, AddressOf sftp_OnAuthenticationSuccess 'successful authentication
        AddHandler sftp.OnAuthenticationFailed, AddressOf sftp_OnAuthenticationFailed 'failed authentication
        AddHandler sftp.OnError, AddressOf sftp_OnError 'error occured


    End Sub

End Module
Posted: 12/08/2008 08:56:31
by Kory Sarnelli (Standard support level)
Joined: 12/05/2008
Posts: 10

Hi there, any update on this?
Posted: 12/08/2008 09:12:15
by Eugene Mayevski (Team)

Moved to HelpDesk for investigation.

Sincerely yours
Eugene Mayevski
Posted: 09/11/2009 03:35:26
by johnny  (Standard support level)
Joined: 08/20/2009
Posts: 19

just for your information I tried above code with VB2008 and it's ok with 60000ms.



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