I have the following code to retrieve a file using FTP (which works fine).

            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(svrPath);

            request.KeepAlive = true;
            request.UsePassive = true;
            request.UseBinary = true;

            request.Method = WebRequestMethods.Ftp.DownloadFile;
            request.Credentials = new NetworkCredential(uname, passw);

            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            using (Stream responseStream = response.GetResponseStream())
            using (StreamReader reader = new StreamReader(responseStream))
            using (StreamWriter destination = new StreamWriter(destinationFile))
            {
                destination.Write(reader.ReadToEnd());
                destination.Flush();
            }

However, when I try to do this using SSL, I am unable to access the file, as follows:

            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(svrPath);

            request.KeepAlive = true;
            request.UsePassive = true;
            request.UseBinary = true;

            // The following line causes the download to fail
            request.EnableSsl = true;

            request.Method = WebRequestMethods.Ftp.DownloadFile;
            request.Credentials = new NetworkCredential(uname, passw);

            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            using (Stream responseStream = response.GetResponseStream())
            using (StreamReader reader = new StreamReader(responseStream))
            using (StreamWriter destination = new StreamWriter(destinationFile))
            {
                destination.Write(reader.ReadToEnd());
                destination.Flush();
            }

Can anyone tell me why the latter would not work?