Authorize Plugin Under authenticated proxy

Hi

I’m trying to authorize the plugin but I can not.
It is a government site on an intranet, and internet access an authenticated proxy is required.
In the wp-config.php file are the credentials for access to the proxy, which allows upgrades and installation of plugins.
But when trying to authorize Google Analytics Dashboard for WP, I have these errors
Last Error: 2015-05-20 13:19:58: exception ‘Google_IO_Exception’ with message ‘connect() timed out!’ in /srv/www/vhosts/dp/wp-content/plugins/google-analytics-dashboard-for-wp/tools/src/Google/IO/Curl.php:86
Stack trace:
#0 /srv/www/vhosts/dp/wp-content/plugins/google-analytics-dashboard-for-wp/tools/src/Google/IO/Abstract.php(135): Google_IO_Curl->executeRequest(Object(Google_Http_Request))
#1 /srv/www/vhosts/dp/wp-content/plugins/google-analytics-dashboard-for-wp/tools/src/Google/Auth/OAuth2.php(113): Google_IO_Abstract->makeRequest(Object(Google_Http_Request))
#2 /srv/www/vhosts/dp/wp-content/plugins/google-analytics-dashboard-for-wp/tools/src/Google/Client.php(133): Google_Auth_OAuth2->authenticate(‘4/0lBdtMSBXtXaB…’)
#3 /srv/www/vhosts/dp/wp-content/plugins/google-analytics-dashboard-for-wp/admin/settings.php(750): Google_Client->authenticate(‘4/0lBdtMSBXtXaB…’)
#4 [internal function]: GADWP_Settings::general_settings(”)
#5 /srv/www/vhosts/dp/wp-includes/plugin.php(496): call_user_func_array(Array, Array)
#6 /srv/www/vhosts/dp/wp-admin/admin.php(226): do_action(‘toplevel_page_g…’)
#7 {main}

It’s possible to configure any file with the credentials for access to the proxy and authorize the plugin?

Thanks

Erivelto

https://www.ads-software.com/plugins/google-analytics-dashboard-for-wp/