Client not connected exception with SSH.Net

Question

I'm having a strange issue with Renci SSH.Net:

var sftp = new SftpClient(remoteHost, remotePort, remoteUserName, remotePassword);
try
{
    sftp.Connect();
    using (var file = new FileOutputStream(filePath))
    {
        sftp.DownloadFile(remoteFileName, file);
    }

    sftp.Disconnect(); // *
}
catch (Exception ex)
{
    // log stuff
    throw;
}
finally
{
    sftp.Dispose();
}

The above code throws at // * with the SshConnectionException: "Client not connected", even though on inspecting sftp.IsConnected just before yields true.

The file downloads as expected.

The stacktrace is as follows:

at Renci.SshNet.Session.SendMessage(Message message)
at Renci.SshNet.Session.SendDisconnect(DisconnectReason reasonCode, String message)
at Renci.SshNet.Session.Disconnect()
at Renci.SshNet.BaseClient.Disconnect()
at My.Program.MyMethod() in c:\path\to\my\program.cs:line 42

My current work around is to catch (SshConnectionException ex) { } -which isn't ideal — dav_i
– dav_i, Commented Aug 27, 2014 at 12:37
I got the same issue and the following exception: System.Net.Internals.SocketExceptionFactory+ExtendedSocketException (0x80004005): No connection could be made because the target machine actively refused it [fe80::1486:3389:4e77:f708%10]:22 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult) at Renci.SshNet.Session.SocketConnect(String host, Int32 port) [link]stackoverflow.com/questions/2972600/… — Canada Wan
– Canada Wan, Commented Apr 25, 2018 at 20:10

Rishab · Accepted Answer · 2014-10-16 20:53:24Z

2

I have the same problem as well.Please go through this https://sshnet.codeplex.com/workitem/1561 to find out the cause. Here is my current work around:

        catch (Exception ex)
        {
            if (ex is SshConnectionException || ex is SocketException)
            {
                _ifwInstance.Error(string.Format("Ignoring {0} during listing directory", ex.Message));
            }
            else
            {
                Debugger.Log(0, null, ex.InnerException.ToString());
                throw new Exception("Login to SFT FAILED", ex);
            }
        }

answered Oct 16, 2014 at 20:53

Rishab

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Brent Over a year ago

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