We currently have WordPress 3.6.1 installed and running on an intranet, and we would like to upgrade to version 3.7. Everything runs fine, except for the "updates". The same problem is present with the plugins. I know some plugins have newer versions, but it won't find them. It keeps telling me everything is up-to-date... I have deleted the _site_transient_update_core (and plugins) keys in the wp_options table, but it didn't solve the problem.
We are behind a proxy (FortiGate) and all the configurations have been added to wp-config.php.
define('WP_PROXY_BYPASS_HOSTS', 'localhost, x.*');
With the proxy interface, I see the request to api.wordpress.org and nothing is being blocked!
I have enabled wp-debug, but no errors are being showed or logged...
all plugins disabled
Any help would be greatly appreciated!