download a mp3 file to iphone problem

I developing an iPhone applica开发者_开发知识库tion..and i facing one problem that i need to download an mp3 file from some FTP server and i used NSURLConnection with NSURLRequest But every time i facing this error

error Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0x187650 {NSErrorFailingURLStringKey=ftp://....../you.mp3, NSErrorFailingURLKey=ftp://....you.mp3, NSLocalizedDescription=The request timed out., NSUnderlyingError=0x17cb20 "The request timed out."}

What is this mean and how can i download this file OR correct this error??

NOTE: I did this exapme using HTTP server and it worj JUST for FTP give this error any advice please :)