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SFTP Connection lost

Posted: 02/04/2008 19:25:21
by Chris Almond (Standard support level)
Joined: 02/04/2008
Posts: 7

SBSimpleSftp.EElSimpleSFTPClientException: Connection lost

Anybody been able to use any port other than 22 for SFTP. I get this error thrown immediately when I try and set the port to 9922. Is this a bug or am I doing something wrong? I have version

Here is some of the code:

Public Sub Connect()

objSFTPClient = New SBSimpleSftp.TElSimpleSFTPClient

objSFTPClient.Address = strRemoteHost ' "claimstest.scmedicaid.com"
objSFTPClient.Port = intPort '22
objSFTPClient.Username = strUser ' "M00348FL3"
objSFTPClient.Password = strPassword ' "m00348fl3"


Catch ex As Exception
Throw (ex)
End Try

End Sub
Posted: 02/05/2008 00:09:47
by Eugene Mayevski (Team)

Please see the article in the knowledgebase. It was written after the numerous questions in the Forum similar to yours.

Sincerely yours
Eugene Mayevski
Posted: 02/06/2008 16:23:50
by Chris Almond (Standard support level)
Joined: 02/04/2008
Posts: 7

Thank you for your reply but please excuse my ignorance here...
I reviewed the article you referenced in the Knowledgebase and tried several items with no avail. See below:

1) "Turn off compression ... via CompressionAlgorithms property of client component."
--> I set CompressionAlgorithms with index 0 and 1 to false, no difference.
2) "Run the sample applications ..."
--> After changing the port number to 9922 in the code of both SFTP sample applications I receive the same error as my code: "SFTP connection failed: Connection failed"
4) "Check the log of the sample project"
--> I was unable to locate any log files for either SFTP sample projects.
5) ".. AutoAdjustCiphers property. Try turning this property on ..."
--> ELSimpleSftpClient class does not contain an "AutoAdjustCiphers" property.
6) "When you use key-based authentication, you need to load the keys correctly: ..."
--> With the SimpleSFTP sample client I tried loading a valid key pair and received the same error message.
7) "... your user account doesn't allow you to access the server using ..."
--> I am able to access the same SFTP server using CUTE FTP Pro with the same credentials and port number.
8) "... check and adust Versions property of the client component."
--> Tested with versions 1-6 using SimpleSFTPclientdemo and same error.

I would really appreciate some help here. Has anyone successfully connected to a host SFTP system via port 9922 using SimpleSFTPClient? Any ideas on what my issue is?

Posted: 02/07/2008 01:23:27
by Eugene Mayevski (Team)

The port number itself doesn't matter. It looks like TCP connection could not be established at all.
Please check with your firewalls - you probably have this port blocked (or you have all ports but 22 and other known ports blocked).

Sincerely yours
Eugene Mayevski
Posted: 02/07/2008 08:57:52
by Chris Almond (Standard support level)
Joined: 02/04/2008
Posts: 7

Thanks for the reply. I'm able to connect via port 9922 using CuteFTP on my development machine so I don't believe we have a firewall issue here.

Posted: 02/07/2008 10:45:32
by Eugene Mayevski (Team)

1) Try calling "telnet <your server> 9922" from command line and see the reply from the server (if there's any)
2) Please copy the exact text of the log messages from the client. Maybe I just don't understand your problem right.

Sincerely yours
Eugene Mayevski
Posted: 02/07/2008 16:05:01
by Chris Almond (Standard support level)
Joined: 02/04/2008
Posts: 7

C:\>telnet qa-ftp.availity.com 9922


Connection to host lost.


I'm using the client under
C:\Program Files\EldoS\SecureBlackbox.NET\Samples\VB.NET\SFTPBlackbox\SimpleSFTPDemo
where do I find the log files for this?

If you want the exact log message from my client which I have developed using the SimpleSFTP classes, they are as follows:

2/6/2008 3:47:11 PM | SBSimpleSftp.EElSimpleSFTPClientException: Connection lost
at TheraSourceEdiCA.SFTP.Connect() in C:\Documents and Settings\calmond\My Documents\Visual Studio Projects\TheraSourceEdiCA\TheraSourceEdiCA\SFTP.vb:line 95
at TheraSourceEdiCA.TheraSourceEDI.SendFilesSFTP(Int32 intEdiGateId, DataView dvTransactions) in C:\Documents and Settings\calmond\My Documents\Visual Studio Projects\TheraSourceEdiCA\TheraSourceEdiCA\TheraSourceEDI.vb:line 138

Thanks for your help.
Posted: 02/08/2008 00:15:38
by Eugene Mayevski (Team)

Chris Almond wrote:
where do I find the log files for this?

At the bottom of the Sample's main form there's a log that shows connection progress. We need that output for better understanding of the problem.

Sincerely yours
Eugene Mayevski
Posted: 02/08/2008 08:28:33
by Chris Almond (Standard support level)
Joined: 02/04/2008
Posts: 7

Sure, no problem.

ElSimpleSftpClient Demo Application

Connection properties
Host: qa-ftp.availity.com
username: testv07328
Private key file ...: <blank>

Time | Event
9:27:25AM SFTP connection failed: Connection lost

Below you can see where I changed the port number in the Connect() sub:

Private Sub Connect()
Dim dlg As frmConnProps

If SftpClient.Active Then
System.Windows.Forms.MessageBox.Show(Me, "Already connected")
Exit Sub
End If
dlg = New frmConnProps
If (dlg.ShowDialog(Me) = Windows.Forms.DialogResult.OK) Then
SftpClient.Username = dlg.tbUsername.Text
SftpClient.Password = dlg.tbPassword.Text
SftpClient.Address = dlg.tbHost.Text
SftpClient.Port = 9922

Posted: 02/08/2008 09:15:55
by Eugene Mayevski (Team)

Great that you have specified the host name.

The client connects fine to this server. Please try setting AutoAdjustCiphers property to false and re-try the instructions in the FAQ text that you tried initially. The client must connect with some combination of options as it does here.

Sincerely yours
Eugene Mayevski



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