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Lisa B
 asked on

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

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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C#

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Last Comment
Lisa B

8/22/2022 - Mon
kaufmed

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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Lisa B

ASKER
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?
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Lisa B

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Lisa B

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