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Error while trying to download file using .net class FtpWebRequest

Error message:

The server returned an address in response to the PASV command that is different from the address to which the FTP connection was made.

I get this message when I try to call the GetResponse () method below ... Please help.

Here is my C # code:

FileStream outputStream = new FileStream (feedXmlPath + "\" + "testXml", FileMode.Create);

        FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpURL + "/" + zipFileName);

        request.UseBinary = true;

        request.Credentials = new NetworkCredential(userName, password);

        request.KeepAlive = false;

        request.Method = WebRequestMethods.Ftp.DownloadFile;

      FtpWebResponse response = (FtpWebResponse)request.GetResponse();
      Stream ftpStream = response.GetResponseStream();

      long cl = response.ContentLength;
      int bufferSize = 2048;
      int readCount;
      byte[] buffer = new byte[bufferSize];

      readCount = ftpStream.Read(buffer, 0, bufferSize);


        while (readCount > 0)
      {
          outputStream.Write(buffer, 0, readCount);
          readCount = ftpStream.Read(buffer, 0, bufferSize);
      }

      ftpStream.Close();
      outputStream.Close();
      response.Close();
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2 answers


Using FTPWebRequest is not allowed for security reasons if you are using NAT. Check this post on Connect .



This post on MSDN might be helpful too.

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Try toggling the passive value to see what works:

    request.UsePassive = false;

It might depend on the firewall between the machines (client and server).

I noticed that if I go through our firewall I need it to stay at True, otherwise it will return an Exception:



The remote server returned an error: (500) Syntax error, command unrecognized.

However, if I am behind a firewall (for example, two machines directly connected to each other in the datacenter), I need to set it to False, otherwise it will return an Exception:

The server returned an address in response to the PASV command, which is different from the address to which the FTP connection was made.

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