I’m trying to upload an image to a server but keep getting http 503 service unavailable or error code 1200. I know the server is too busy, but the others can upload their images successfully – what am I doing wrong?

Here is my code:

private async Task UploadImage()
{
    while (true)
    {
        try
        {
            var request = new HttpRequestMessage(HttpMethod.Post, "Submission/Home/AjaxPhotoUpload");
            var content = new MultipartFormDataContent
                              {
                                  {
                                      new StreamContent(File.OpenRead(_citizen.PhotoPath)), _citizen.imageUpload , _citizen.FileNameWithExt
                                  },
                                  { 
                                      new StringContent("-1"), "subDocIndex"
                                  }
                              };
            request.Content = content;
            var response = await _httpClient.SendAsync(request);

            if (response.IsSuccessStatusCode)
            {
                Console.WriteLine("uploaded image");                
                break;
            }
            else
            {
                Console.WriteLine("FAILED to upload image");
            }

            // var result = await response.Content.ReadAsStringAsync();
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }
    }
}

ServerConnected:    12:00:02.205
FiddlerBeginRequest:    12:01:41.885
ServerGotRequest:   12:01:41.885
ServerBeginResponse:    12:02:23.100
GotResponseHeaders: 12:02:23.100
ServerDoneResponse: 12:02:23.100
ClientBeginResponse:    12:02:23.100
ClientDoneResponse: 12:02:23.100

It’s Fiddler statistics..
I
tried it with 8 dedicated server and different ips. result same