YouTube Sidebar Widget – YouTube service unavailable

The plugin uses cURl direkt instead of WordPress’ built in HTTP class. If your sever does not support cURL, the plugin can not work and you got this message. Deinstall the plugin and use another one. Or replace the curl_it() function within the plugin with something stable.

Update

The workaraound:

Open the plugin file youtube-sidebar-widget.php and replace the function curl_it() with this:

function curl_it($url) {

  $data = wp_remote_get( $url );

  return ( ! is_wp_error( $data ) && isset( $data['body'] ) ) ?
    $data['body'] : false;

}