FtpWebRequest returns error 550 File unavailable

I have created a small windows forms application to upload the file to one of our client's ftp site. But the problem that I'm having is that when I run this application on my local machine it uploads the file successfully. But if I run this program on our server, I get this error message;

remote server returned an error: (550) File unavailable (eg, file not found, can not access the file), on this line 'objFTPRequest.GetRequestStream();'.

Does anybody know why? Do I need to configure the firewall or something? Here is my code;

FileInfo objFile = new FileInfo(filename);
FtpWebRequest objFTPRequest;

// Create FtpWebRequest object 
objFTPRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/outbox/" + objFile.Name));

// Set Credintials
objFTPRequest.Credentials = new NetworkCredential(ftpUserName, ftpPassword);

// By default KeepAlive is true, where the control connection is 
// not closed after a command is executed.
objFTPRequest.KeepAlive = false;

// Set the data transfer type.
objFTPRequest.UseBinary = true;

// Set content length
objFTPRequest.ContentLength = objFile.Length;

// Set request method
objFTPRequest.Method = WebRequestMethods.Ftp.UploadFile;

// Set buffer size
int intBufferLength = 16 * 1024;
byte[] objBuffer = new byte[intBufferLength];

// Opens a file to read
FileStream objFileStream = objFile.OpenRead();


// Get Stream of the file
Stream objStream = objFTPRequest.GetRequestStream();

int len = 0;

while ((len = objFileStream.Read(objBuffer, 0, intBufferLength)) != 0)
{
    // Write file Content 
    objStream.Write(objBuffer, 0, len);

}

            objStream.Close();
            objFileStream.Close();

This error can be caused because of several reasons like file is not present on server, security permissions on file etc. etc.

First you need to find out the exact cause of error. This can be achieved by using following code-

try
{
        //Your code
}
catch(WebException e)
{
        String status = ((FtpWebResponse)e.Response).StatusDescription;
}

Once you get the exact cause of error, you can go forward to solve it.

Here are some links you can refer

http://forums.asp.net/t/1777881.aspx/1

http://nickstips.wordpress.com/2010/10/25/c-ftp-upload-error-the-remote-server-returned-an-error-550-file-unavailable-e-g-file-not-found-no-access/

http://www.dreamincode.net/forums/topic/76361-file-upload-to-server/

http://forums.asp.net/t/1374306.aspx/1

Try this: ftp://xxx.xxx.xx.xx:21//path/filename

The "//" after the server address starts you out at the root directory. Even though I had: ftp://xxx.xxx.xx.xx:21/path/filename, it didn't take me to the correct directory.

I met the same problem, and this is what I did:

1. Check the OS has the right to write. Find the ftp folder =>right click=>properties=>security, then you must know what you should do
2. Check the ftp server open the write right to the user you logged. Open IIS=>click the ftp site=>ftp Authorization Rules=>add allow rules=>choose a user or group to set the rights
3. Check the the dir on the ftp server, do the same thing on item 2.

I can use four pictures to show the rights to be set:

It could be more simple.

I facing similar issue and i tried all the suggested solution but no one work. I'm figure out in simple manner like this one : take a look

Wrong code at my end

 Dim request As Net.FtpWebRequest = CType(FtpWebRequest.Create("ftp://xxx.xxx.xxx.xxx/files"), FtpWebRequest)

Change it in this simple one :

 Dim request As Net.FtpWebRequest = CType(FtpWebRequest.Create("ftp://xxx.xxx.xxx.xxx/files/youfilename.ext"), FtpWebRequest)

then procced with fill request and send to server :)

That's all.

Make sure that all permission on server work fine and u're using right credential.

I found the solution. The problem is the Current Working Directory of the ftp user. If you type a url like ftp:///path/test.txt it is used as a relative path ro the working directory. For example CWD is /test then the used path is /test/path/test.txt. If you want to use an absolute path, you have to type the url like ftp:////path/test.txt. Then the file is uploaded in the folder /path/test.txt, without exception.