FtpWebRequest - The underlying connection as closed: An unexpected error has occurred on a receive

Lisa B
Lisa B used Ask the Experts™
on
Hi Everyone

I am trying to upload a csv which at most has about 15 records to a ftp site but I am getting the error - The underlying connection as closed: An unexpected error occurred on a receive.

Does anyone have any suggestions on how to fix this error?

Using visual studio 2010

Thanks


        public void SendFile(string filename)
        {

            string ftpServerIP = "ftp.test.org";
            string ftpUserID = "Test";
            string ftpPassword = "1234";
            string ftpDirectory = "incoming";


            FileInfo fileInf = new FileInfo(filename);

            string uri = "ftp://" + ftpServerIP + "/" + ftpDirectory;

            FtpWebRequest reqFTP;

            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + ftpDirectory));

            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

            reqFTP.UsePassive = true;
            reqFTP.UseBinary = true;
            reqFTP.KeepAlive = false;

            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

            reqFTP.Timeout = 10000000;

            reqFTP.ReadWriteTimeout = 10000000;

            reqFTP.ContentLength = fileInf.Length;

            // The buffer size is set to 2kb
            int buffLength = 2048;

            byte[] buff = new byte[buffLength];

            int contentLen;

            // Opens a file stream (System.IO.FileStream) to read the file to be uploaded

            FileStream fs = fileInf.OpenRead();

            try
            {

                // Stream to which the file to be upload is written

                Stream strm = reqFTP.GetRequestStream();

                strm.ReadTimeout = 9999999;
                strm.WriteTimeout = 9999999;

                // Read from the file stream 2kb at a time

                contentLen = fs.Read(buff, 0, buffLength);

                // Until Stream content ends

                while (contentLen != 0)
                {

                    // Write Content from the file stream to the FTP Upload Stream

                    strm.Write(buff, 0, contentLen);

                    contentLen = fs.Read(buff, 0, buffLength);

                }

                // Close the file stream and the Request Stream

                strm.Close();

                fs.Close();

            }

            catch (Exception ex)
            {

                Console.WriteLine(ex.Message, "Upload Error");

            }

        }

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Most Valuable Expert 2011
Top Expert 2015

Commented:
When you build the URI for the upload, it needs to include the filename, not simply the directory where you're going to put the file. This may be why you are receiving the error. Try including the filename also:

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + ftpDirectory + "/" + fileInf.Name));

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Author

Commented:
Hi

I have changed the code to

string ftpServerIP = "ftp.test.org";
string ftpUserID = "Test";
string ftpPassword = "1234";
string ftpDirectory = "incoming";

FileInfo fileInf = new FileInfo(filename);

string uri = "ftp://" + ftpServerIP + "/" + ftpDirectory + "/";

FtpWebRequest reqFTP;

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + ftpDirectory + "/" + fileInf.Name));

reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

reqFTP.UsePassive = true;
reqFTP.UseBinary = true;
reqFTP.KeepAlive = false;

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And I am still getting the same error.  The line below

FileInfo fileInf = new FileInfo(filename);

filename has the full location of the file on my pc is that correct?
Commented:
Hi

Was able to get the problem solved using the code below

        public void SendFile(string filename)
        {

            string ftpServerIP = "ftp://ftp.test.org";
            string ftpUserID = "Test";
            string ftpPassword = "1234";
            string destinationPath = @"/incoming/";
            FileInfo fileInf = new FileInfo(filename);

            try
            {

                FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpServerIP + destinationPath + Path.GetFileName(filename));
                request.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                request.Method = WebRequestMethods.Ftp.UploadFile;

                request.UseBinary = false;
                request.UsePassive = false;

                request.ContentLength = fileInf.Length;
                // The buffer size is set to 2kb
                int buffLength = 2048;
                byte[] buff = new byte[buffLength];
                int contentLen;
                // Opens a file stream (System.IO.FileStream) to read the file to be uploaded
                FileStream fs = fileInf.OpenRead();
                try
                {
                    // Stream to which the file to be upload is written
                    Stream strm = request.GetRequestStream();
                    // Read from the file stream 2kb at a time
                    contentLen = fs.Read(buff, 0, buffLength);
                    // Until Stream content ends
                    while (contentLen != 0)
                    {
                        // Write Content from the file stream to the FTP Upload Stream
                        strm.Write(buff, 0, contentLen);
                        contentLen = fs.Read(buff, 0, buffLength);
                    }
                    // Close the file stream and the Request Stream
                    strm.Close();
                    fs.Close();
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message, "Upload Error");
                }


            }
            catch (Exception Ex)
            {
                Console.WriteLine(Ex.ToString());
                Console.ReadKey(false);
            }
        }

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Author

Commented:
No other solutions provided - was able to get this working after several days using the code in my comment above

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