Cannot send command to the server because the response for previous one was not received

Subject: Cannot send command to the server because the response for previous one was not received Date: 2013-09-15 07:21:32 From: Magnus Modig Source: cannot-send-command-server-response-previous-one-not-received ----------------------------------------------------------------------

I use the following code to download files from a ftp server

[code lang='c#']

            // Create a new Ftp instance.
            var client = new Ftp();

            try
            {

                // Connect to the FTP server.
                client.Connect(FtpServer, FtpPort);

                client.Passive = false;
                client.Timeout = 60000; // 1 minut innan timeout

                // Authenticate.
                client.Authenticate(UserName, PassWord);
                client.KeepAlive();

                // Let the Ftp class keeps the connection alive during transfer a large file.
                client.KeepAliveDuringTransfer = true;
                // Keep alive every 1 second.
                client.KeepAliveInterval = 1000;

                // Register an event handler.
                client.Progress += client_Progress;

                foreach (var f in ListOfFiles)
                {

                    CurrFileToFetch = f.FileName.ToString();

                    client.SetCurrentDirectory(f.FolderPath);

                    if (client.FileExists(f.FileName.ToString()))
                    {
                        try
                        {
                            client.DownloadFile(f.FileName.ToString(), DestinationFolder + f.FileName.ToString());
                        }
                        catch (Exception ioexp)
                        {
                            // IO error
                        }

                    }
                    else
                    {


                    }

                }

                // Disconnect.
                client.Disconnect();
            }
            catch (Exception exp)
            {

                FtpError += exp.Message.ToString();
            }
            finally
            {
                if (client.IsConnected)
                { client.Disconnect(); }
            }


[/code]

But I often get this error message "Cannot send command to the server because the response for previous one was not received." , why is that and how can I fix that?

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