Create FTP connect and upload file is fine in AIR but fail in SWF?

I was have a project. It need to use FTP to upload files. And it works fine when I export to AIR.

Now.....I want to use it on web. So I export to SWF then....eternal error....

Below is my code

Thanks for your patience

private function connect():void{

            ftpSocket = new Socket();

            ftpSocket.addEventListener(ProgressEvent.SOCKET_DATA, SocketData);

            ftpSocket.addEventListener(IOErrorEvent.IO_ERROR, IOError);

            ftpSocket.addEventListener(SecurityErrorEvent.SECURITY_ERROR, SecError);

            ftpSocket.addEventListener(Event.CONNECT, SocketConn);

            ftpSocket.addEventListener(Event.CLOSE, SocketClose);

            ftpSocket.addEventListener(Event.ACTIVATE, SocketAtivate);

            ftpSocket.connect(server,21);

            sendCommand("USER "+this.user);

        }

Error Message like this

*** Security Sandbox Violation ***

連線至 xx.x.xxx.x:21 已終止 - http://test.com.tw/test.swf?ts=1413962614971不允許

錯誤: 拒絕 xmlsocket://xx.x.xxx.x:21 的資源請求   由於沒有原則檔權限