Is it possible to do "Active" mode FTP using FtpWebRequest?

c# ftp ftpwebrequest
Rowland Shaw picture Rowland Shaw · Mar 22, 2011 · Viewed 12.1k times · Source

Due to some firewall issues, we need to do FTP using "active" mode (i.e. not by initiating a PASV command).

Currently, we're using code along the lines of:

// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://www.contoso.com/test.htm");
request.Method = WebRequestMethods.Ftp.UploadFile;

// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential ("anonymous","[email protected]");

// Copy the contents of the file to the request stream.
StreamReader sourceStream = new StreamReader("testfile.txt");
byte [] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;

Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();

FtpWebResponse response = (FtpWebResponse)request.GetResponse();
response.Close();

But this seems to default to using passive mode; Can we influence this to force it to upload using active mode (in the same way that the command line ftp client does)?

Answer

nos picture nos · Mar 22, 2011

Yes, set the UsePassive property to false.

request.UsePassive = false;

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