Hi,
WordPress needs access to the a range of sites using HTTP and HTTPS over port 80 and 443.
You could try locking it down to *.www.remarpro.com but I’d keep it open to the internet at large.
If you are behind a proxy you can also set proxy settings in wp-config.php as follows:
/* Configure proxy Server */
define('WP_PROXY_HOST', 'proxy');
define('WP_PROXY_PORT', '8080');
define('WP_PROXY_USERNAME', '');
define('WP_PROXY_PASSWORD', '');
define('WP_PROXY_BYPASS_HOSTS', 'localhost');
Lastly, if you want to make WordPress not connect to the internet at all you can set WP_HTTP_BLOCK_EXTERNAL
to true in wp-config.php. If this is not set but your firewall is blocking traffic it can really slow down the WordPress UI. This is because some admin screens in particular will request external resources, eg. WordPress news RSS feed, and not render until the request times out.
Hope this helps