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

Question

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)?

Martsen

.Net Reflector will tell you the answer. :) Much easier are the MSDN docs though. msdn.microsoft.com/en-us/library/… – Cosmography

Answer 1

Yes, set the UsePassive property to false.

request.UsePassive = false;

Pollen

Doh. Less than brilliant default that. And there was me looking for a Mode property/enum. – Martsen

Sometimes, the solution is so simple that you feel kinda dumb when you see it. This is one of those times where I feel kinda dumb ;) – Retaliate