Error uploading file to FTP Server - Error 451

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.NET2.0

C#

.NET

Visual-Studio

, +

Hi guys,
I am facing a problem with my FTP to upload a file to the FTP Server.
I keep on getting an error "The remote server returned an error: (451) Local error in processing.
I have tried Passive mode, but with no luck. Any recommendations are welcome.
Please see my code below:

private void Upload(string filename, string ftpServerIP, string ftpUser,string ftpPassword)
        {
            MakeDir(filename, ftpServerIP, ftpUser, ftpPassword);
            FileInfo fileInf = new FileInfo(filename);
            string uri = "ftp://" + ftpServerIP + "/" + Txt_TransferTo.Text+ "/" + fileInf.Name;
            FtpWebRequest FTPreq;
            FTPreq = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + Txt_TransferTo.Text+ "/" + fileInf.Name));
            FTPreq.Credentials = new NetworkCredential(ftpUser, ftpPassword);
            FTPreq.Method = WebRequestMethods.Ftp.MakeDirectory;
            FTPreq.KeepAlive = false;
            FTPreq.Method = WebRequestMethods.Ftp.UploadFile;
            FTPreq.UseBinary = true;
            FTPreq.ContentLength = fileInf.Length;
            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;
            FileStream fs = fileInf.OpenRead();
            try
            {
                Stream strm = FTPreq.GetRequestStream();
                contentLen = fs.Read(buff, 0, buffLength);
                while (contentLen != 0)
                {
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
                strm.Close();
                fs.Close();
                InfoMessage("File uploaded succesfully", 1);
            }
            catch (Exception ex)
            {
                InfoMessage(ex.Message, 0);
            }
        }




private void MakeDir(string dirName, string ftpServerIP, string ftpUser, string ftpPassword)
        {
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + dirName));
                reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUser, ftpPassword);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();

                ftpStream.Close();
                response.Close();
            }
            catch { }
        }

and i call it via

Upload("filename", "ftp.XXXXX.XX.XX", "UserName", "Password");

but with no luck.
Thanks