Solved

The underlying connection was closed: The server committed a protocol violation

Posted on 2012-03-21
4
2,634 Views
Last Modified: 2012-03-23
I was uploading my file using below code,it works fine but some time it throws this error"The underlying connection was closed: The server committed a protocol violation" and stop the process ,when i run it again it upload file with out any issue.

One thing i noticed,if i run this process to upload multiple files then i get this error sometime,if i do less than 5 files then it works fine,any idea where and what i have to look in to it.

I was searchin google nothing found solid solution for this,even one of the msdn blog saying its a bug in FTPwebrequest but not sure.

Thanks in Advance

 
                    FileInfo fileInf = new FileInfo(filename);
                    FtpWebRequest reqFTP;
    
                    // Create FtpWebRequest object from the Uri provided
                    reqFTP = (FtpWebRequest)FtpWebRequest.Create
                             (new Uri(path + fileInf.Name));
    
                    
                    // Provide the WebPermission Credintials
                     reqFTP.Credentials = new NetworkCredential(user, pwd);
    
                    // By default KeepAlive is true, where the control connection
                    // is not closed after a command is executed.
                    reqFTP.KeepAlive = false;
    
    
                    // Specify the command to be executed.
                    reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
    
                    // Specify the data transfer type.
                    reqFTP.UseBinary = true;
                    reqFTP.Timeout = -1;
                    reqFTP.UsePassive = true;
    
    
                    // Notify the server about the size of the uploaded file
                    reqFTP.ContentLength = fileInf.Length;
    
                    // The buffer size is set to 2kb
                    int buffLength = 4096;
                    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();
    
                        // Read from the file stream 2kb at a time
                        contentLen = fs.Read(buff, 0, buffLength);
    
                        // Till 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();
                    }

Open in new window

0
Comment
Question by:Sha1395
  • 2
4 Comments
 
LVL 26

Expert Comment

by:Shaun Kline
ID: 37753450
Not sure if this is the issue, but I noticed in your comments that you want to read in 2kb (2 * 1024 = 2048) increments, but you are actually reading in 4kb increments (4 * 1024 = 4096). There could also be a size/time duration issue as you state that this occurs more frequently with multiple files uploads. You can test this by comparing the total size of the files and playing with files of different sizes.
0
 
LVL 18

Accepted Solution

by:
Gary Davis earned 500 total points
ID: 37754228
Try changing the KeepAlive property to true.

Gary Davis
0
 

Author Comment

by:Sha1395
ID: 37755127
Thanks gardavis and Shaun_Kline. Tried with both your suggestion but it works only after KeepAlive property set True.

Thanks again for your help.

I have a question for you gardavis, if i keep the connection Alive,how many connection will open at the same time ? is this any performance deficiency am gonna face ?

Thanks in advance
0
 
LVL 18

Expert Comment

by:Gary Davis
ID: 37757067
I am not sure but I really don't think it should be an issue.
0

Featured Post

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

Introduction                                                 Was the var keyword really only brought out to shorten your syntax? Or have the VB language guys got their way in C#? What type of variable is it? All will be revealed.   Also called…
This article describes a simple method to resize a control at runtime.  It includes ready-to-use source code and a complete sample demonstration application.  We'll also talk about C# Extension Methods. Introduction In one of my applications…
Illustrator's Shape Builder tool will let you combine shapes visually and interactively. This video shows the Mac version, but the tool works the same way in Windows. To follow along with this video, you can draw your own shapes or download the file…
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.

760 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now