Why won't this code play videos from a URL?

Question

What is wrong with this code?

{
    NSString *s = [urls objectAtIndex:selectedPage];

    NSLog(@"video = %@\n", s);  // JT 10.07.31
    theMoviePlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL fileURLWithPath: s]];

//? theMoviePlayer.scalingMode=MPMovieScalingModeAspectFill;

    [self.view addSubview:theMoviePlayer.view];
    //[theMoviePlayer play]; // Movie playback is asynchronous, so this method returns immediately.
    //[self presentMoviePlayerViewControllerAnimated:theMoviePlayer];   // JT 10.08.07

    //---play movie---
    MPMoviePlayerController *player = [theMoviePlayer moviePlayer];
    [player play];
}

It will play videos from a local file, but the same file on a server doesn't play. Instead it returns this error:

2010-08-07 13:38:36.229 Fashion[47473:207] video = NYM_NAME_SLATE.mp4">http://gravuremag.com/ssp_director/albums/album-54/lg/KIKI_NYM_NAME_SLATE.mp4 2010-08-07 13:38:36.314 Fashion[47473:207] NSConcreteNotification 0xae175b0 {name = MPMoviePlayerPlaybackDidFinishNotification; object = ; userInfo = { MPMoviePlayerPlaybackDidFinishReasonUserInfoKey = 1; error = Error Domain=MediaPlayerErrorDomain Code=2 UserInfo=0xae172b0 "This movie could not be played."; }}