server error

Hi
I got this error on my wordpress

Warning: An unexpected error occurred. Something may be wrong with ww.wp.xz.cn or this server’s configuration. If you continue to have problems, please try the support forums. (WordPress could not establish a secure connection to ww.wp.xz.cn. Please contact your server administrator.) in /home/airsaizg/public_html/wp-includes/update.php on line 295

The site I need help with is http://www.airsat.co.za.