Seeing the headline should you all know what it means. By default, on the control panel WordPress will automatically received some update informations about news and plugins and so on. Of course, some people would like them, but some hate them. Of course, if you do not like this feature, you can disable it through the following method.
Step one：find the wp-config.php file in the root directory of WordPress；
Step two：add the following code into it:
define('WP_HTTP_BLOCK_EXTERNAL', true);
Step three(optional)：you can add one white list in the function below, the white list comprises of some URLs such as: rpc.pingomatic.com etc.
define('WP_ACCESSIBLE_HOSTS', 'rpc.pingomatic.com');