c# ftp upload large files exception

Question

0.00/5 (No votes)

See more:

Hi, I am trying to upload files from one server to another
Everything works fine with small files(< 30MB), but when I try to upload a large file, an error appears "The connection was closed: An unexpected error occurred on a receive"

this is my code:

C#

try
        {
            string dir = ConfigurationManager.AppSettings["ftp"].ToString();
            string user = ConfigurationManager.AppSettings["ftpUser"].ToString();
            string pass = ConfigurationManager.AppSettings["ftpPass"].ToString();

            //SUBIR

            DirectoryInfo directory = new DirectoryInfo(Server.MapPath("/documentos/" + clave + "/"));
            FileInfo[] files = directory.GetFiles("*.pdf");
			
			FtpWebRequest requestFTPUploader = (FtpWebRequest)WebRequest.Create(dir + "/" + "PANDEMO" + clave + "/");
            requestFTPUploader.Credentials = new NetworkCredential(user, pass);
            requestFTPUploader.Method = WebRequestMethods.Ftp.MakeDirectory;
            StreamReader reader = new StreamReader(requestFTPUploader.GetResponse().GetResponseStream());
            
            for (int i = 0; i < files.Length; i++)
            {
                requestFTPUploader = (FtpWebRequest)WebRequest.Create(dir + "/" + "PANDEMO" + clave + "/" + files[i].Name);
                requestFTPUploader.Credentials = new NetworkCredential(user, pass);
                requestFTPUploader.UsePassive = true;
                requestFTPUploader.UseBinary = true;
                requestFTPUploader.KeepAlive = true;
                requestFTPUploader.Method = WebRequestMethods.Ftp.UploadFile;
                requestFTPUploader.Timeout = -1;

                reader = new StreamReader(requestFTPUploader.GetResponse().GetResponseStream());

                FileInfo fileInfo = new FileInfo(Server.MapPath("/documentos/" + clave + "/" + files[i].Name));
                FileStream fileStream = fileInfo.OpenRead();

                int bufferLength = 2048;
                byte[] buffer = new byte[bufferLength];

                Stream uploadStream = requestFTPUploader.GetRequestStream();
                int contentLength = fileStream.Read(buffer, 0, bufferLength);
                uploadStream.WriteTimeout = -1;
                uploadStream.ReadTimeout = -1;
                while (contentLength != 0)
                {
                    uploadStream.Write(buffer, 0, contentLength);
                    contentLength = fileStream.Read(buffer, 0, bufferLength);
                }
                uploadStream.Close(); 
                fileStream.Close();

                

                requestFTPUploader = null;
            }
        }
        catch (Exception err)
        {
            ShowMssg(err.Message);

        }

also, in the web.config I used this:

HTML

<security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="314572800"/>
      </requestFiltering>
    </security>
<system.web>
    <httpRuntime maxRequestLength="307200" executionTimeout="100000"/>
...

Does someone knows why Only happens with large files?

Posted 9-Jul-14 13:21pm

memd24

Add a Solution

Comments

CHill60 9-Jul-14 19:22pm

Timeout perhaps?

memd24 10-Jul-14 10:13am

I added .TimeOut = -1, before I used .timeOut = 1000000000, but nothing, the same issure. Can affect the IIS in the ftp server?
UPDATE
I discovered that the issure occurs in the
uploadStream.Close();
When I try to sent a 140mb file from the first server to the second, it finish the the while code, and when it go to close it, it goes to the catch line and show the error "An unexpected error occurred on a receive"

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jeffrey Bruskin · Answer 1 · 2014-07-10T07:46:00

Solution 2

Since its a large file the OS will send it in chunks. Probably there is still some bytes in the buffer when you go to close it. Try uploadStream.Flush() before closing the stream to write the last of the bytes to the stream first.

Posted 10-Jul-14 7:46am

Jeffrey Bruskin