Ftp throws WebException only in .NET 4.0

Posted by Trakhan on Stack Overflow See other posts from Stack Overflow or by Trakhan
Published on 2011-01-05T13:44:24Z Indexed on 2011/01/05 13:54 UTC
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I have following c# code. It runs just fine when compiled against .NET framework 3.5 or 2.0 (I did not test it against 3.0, but it will most likely work too). The problem is, that it fails when built against .NET framework 4.0.

        FtpWebRequest Ftp = (FtpWebRequest)FtpWebRequest.Create(Url_ + '/' + e.Name);

        Ftp.Method = WebRequestMethods.Ftp.UploadFile;
        Ftp.Credentials = new NetworkCredential(Login_, Password_);
        Ftp.UseBinary = true;
        Ftp.KeepAlive = false;
        Ftp.UsePassive = true;

        Stream S = Ftp.GetRequestStream();

        byte[] Content = null;
        bool Continue = false;
        do
        {
            try
            {
                Continue = false;
                Content = File.ReadAllBytes(e.FullPath);
            }
            catch (Exception)
            {
                Continue = true;
                System.Threading.Thread.Sleep(500);
            }
        } while (Continue);

        S.Write(Content, 0, Content.Length);
        S.Close();

        FtpWebResponse Resp = (FtpWebResponse)Ftp.GetResponse();
        if (Resp.StatusCode != FtpStatusCode.CommandOK)
            Console.WriteLine(Resp.StatusDescription);

The problem is in call Stream S = Ftp.GetRequestStream();, which throws an en instance of WebException with message “The remote server returned an error: (500) Syntax error, command unrecognized”.

Does anybody know why it is so?

PS. I communicate virtual ftp server in ECM Alfresco.

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