550 file unavailable error with FtpWebRequest class file upload. Works fine in FileZilla

Question

I\'m searched and found other questions on this but none have solved my issues. I\'m trying to upload a file via FTP using sample MSDN code. I get the The remote server retu

Answer 1

It's difficult to tell without detailed information about the error, but it seems most likely that somewhere in your path there's a directory missing. One thing to try if you use any non-standard characters in your FTP file path is to use HttpUtility.UrlPathEncode on it prior to adding it to the Url.

To get detailed troubleshooting information, I add the following inside the configuration element of my application's .config file:

Also, just for reference, here's the code I use for uploads:

    private static FtpWebRequest CreateFtpWebRequest(string ftpUrl, string userName, string password, bool useSsl, bool allowInvalidCertificate, bool useActiveFtp)
    {
        FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpUrl);
        request.Credentials = new NetworkCredential(userName, password);

        if (useSsl)
        {
            request.EnableSsl = true;

            if (allowInvalidCertificate)
            {
                ServicePointManager.ServerCertificateValidationCallback = ServicePointManager_ServerCertificateValidationCallback;
            }
            else
            {
                ServicePointManager.ServerCertificateValidationCallback = null;
            }
        }

        request.UsePassive = !useActiveFtp;

        return request;
    }

    private static void UploadFileToServer(string ftpUrl, string userName, string password, bool useSsl, bool allowInvalidCertificate, bool useActiveFtp, string filePath)
    {
        FtpWebRequest request = CreateFtpWebRequest(ftpUrl, userName, password, useSsl, allowInvalidCertificate, useActiveFtp);

        request.Method = WebRequestMethods.Ftp.UploadFile;

        long bytesReceived = 0;
        long bytesSent = 0;

        using (Stream requestStream = request.GetRequestStream())
        using (FileStream uploadFileStream = File.OpenRead(filePath))
        {
            // Note that this method call requires .NET 4.0 or higher. If using an earlier version it will need to be replaced.
            uploadFileStream.CopyTo(requestStream);
            bytesSent = uploadFileStream.Position;
        }

        using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
        {
            bytesReceived = response.ContentLength;
        }
    }