Exception thrown while uploading file on FTP server from Windows Phone 8

Question

I want to upload a video file on FTP server, my all search results ended to MSDN managzine article Adding FTP Support in Windows Phone 8. It has awesome example & library. I tried 2 FTP URLs, one is Mozilla repository & another is my confidential URL. Nothing worked for me but throws exception. I tried my FTP URL in an app called File Downloader, it worked correctly. Expcetion details & output windows log is given below.

Thus, any one can suggest me what should I do changes in that library? Is there another working library available or any other way to upload file to FTP?

Exception is thrown in file FtpClient.cs, event FtpClientSocket_DataReceived(...), at line "await PrepareDataChannelAsync(Response);" [Line # 253]

ftp.mozilla.org

System.Exception: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. (Exception from HRESULT: 0x8007274C)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at WinPhoneFtp.FtpService.FtpClient.<PrepareDataChannelAsync>d__2b.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at WinPhoneFtp.FtpService.FtpClient.<FtpClientSocket_DataReceived>d__3.MoveNext()

Output log

FTP Server IP Address: ftp.mozilla.org with port 21
FTP Command Channel Initailized
FTPServer -> 220-
220-   ftp.mozilla.org / archive.mozilla.org - files are in /pub/mozilla.org
220-
220-   Notice: This server is the only place to obtain nightly builds and needs to
220-   remain available to developers and testers. High bandwidth servers that
220-   contain the public release files are available at ftp://releases.mozilla.org/
220-   If you need to link to a public release, please link to the release server,
220-   not here. Thanks!
220-
220-   Attempts to download high traffic release files f
FTPServer -> rom this server will get a
220-   "550 Permission denied." response.
220 
FTPClient -> USER anonymous
FTPServer -> 331 Please specify the password.
FTPClient -> PASS [e-mail]
FTPServer -> 230-
230-   ftp.mozilla.org / archive.mozilla.org - files are in /pub/mozilla.org
230-
230-   Notice: This server is the only place to obtain nightly builds and needs to
230-   remain available to developers and testers. High bandwidth servers that
230-   contain the public release files are available at ftp://releases.mozilla.org/
230-   If you need to link to a public release, please link to the release server,
230-   not here. Thanks!
230-
230-   Attempts to download high traffic release files f
FTPClient -> PWD
FTPServer -> rom this server will get a
230-   "550 Permission denied." response.
230 Login successful.
FTPClient -> PASV
FTPServer -> 257 "/"
FTPServer -> 227 Entered Passive Mode (63,245,215,46,199,76)
FTP Data Channel IPAddress: 63.245.215.46, Port: 50951
A first chance exception of type 'System.Exception' occurred in mscorlib.ni.dll
An exception of type 'System.Exception' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
A first chance exception of type 'System.Exception' occurred in mscorlib.ni.dll

========================================================================================================================

Confidential FTP URL which required authentication

System.Exception: No connection could be made because the target machine actively refused it. (Exception from HRESULT: 0x8007274D)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at WinPhoneFtp.FtpService.FtpClient.<PrepareDataChannelAsync>d__2b.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at WinPhoneFtp.FtpService.FtpClient.<FtpClientSocket_DataReceived>d__3.MoveNext()

Output log

FTP Server IP Address: --CONFIDENTIAL-- with port 21
FTP Command Channel Initailized
FTPServer -> 220 (vsFTPd 2.0.5)
FTPClient -> USER --CONFIDENTIAL--
FTPServer -> 331 Please specify the password.
FTPClient -> PASS --CONFIDENTIAL--
FTPServer -> 230 Login successful.
FTPClient -> PWD
FTPClient -> PASV
FTPServer -> 257 "/"
FTPServer -> 227 Entering Passive Mode (173,193,219,177,156,29)
FTP Data Channel IPAddress: 173.193.219.177, Port: 39938
A first chance exception of type 'System.Exception' occurred in mscorlib.ni.dll
An exception of type 'System.Exception' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
A first chance exception of type 'System.Exception' occurred in mscorlib.ni.dll

Below given code works on Windows 8 but throws NotSupportedException on Windows Phone 8

var ftpURL = "ftp://ftp.url.com";
var request = WebRequest.Create(ftpURL + "/" + file_name.ext);
request.Credentials = new NetworkCredential("uname", "pwd");
request.Method = "STOR";

byte[] fileBytes = null;
using (var stream = await objStorageFile.OpenReadAsync())
{
    fileBytes = new byte[stream.Size];
    using (var reader = new DataReader(stream))
    {
        await reader.LoadAsync((uint)stream.Size);
        reader.ReadBytes(fileBytes);
    }
}

var requestStream = request.BeginGetRequestStream(async a =>
{
    var requestStreamEnd = request.EndGetRequestStream(a);
    await requestStreamEnd.WriteAsync(fileBytes, 0, fileBytes.Length);
    await requestStreamEnd.FlushAsync();
}, request);

var respo = request.BeginGetResponse(b =>
{
    var res = request.EndGetResponse(b);
    var aa = res.Headers;
}, null);

Answer 1

In Windows Phone, you can't create a WebRequest using a FTP Uri scheme.  The NotSupportedException is thrown from there, correct? (Line 2 in your lowest sample in your post)

---

Darin R.

Answer 2

OK, but how can I use that library which is in MSDN magazine article, forget about WebRequest?

Answer 3

Ok, maybe I jumped the gun. The second code is windows 8 ftp using WebClient, the first is a log output of Windows Phone 8.

Can you post the code for the Windows Phone 8 that uses the FTPClient from the MSDN article - the exact code that creates the log entries?

---

Darin R.

Answer 4

I found exception in the sample code of that article itself. You can download from here. I can see some apps on store already which allows FTP access, file upload/download etc. So I hope that library should work any how.