TimeSpan ts = new TimeSpan(0, 5, 0);
            SessionOptions sessionOptions = new SessionOptions
            {
                Protocol = Protocol.Sftp,
                HostName = host,
                PortNumber = port,
                UserName = userName,
                Password = password,
                Timeout = ts,
                SshHostKeyFingerprint = "ssh-dss 1024 [xxx]="
            };

            using (WinSCP.Session session = new WinSCP.Session())
            {
                session.SessionLogPath = "winscplog.txt";
                // Connect
                session.Open(sessionOptions);  // <---- Error here

                // Upload files
                TransferOptions transferOptions = new TransferOptions();
                transferOptions.TransferMode = TransferMode.Binary;

                TransferOperationResult transferResult;
                transferResult =
                    session.PutFiles(fileName, dir, false, transferOptions);

                // Throw on any error
                transferResult.Check();

            }