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WP_FAIL2BAN_PROXIES not working (empty proxy IP list)

Hi,

I’m facing an issue using WP_FAIL2BAN_PROXIES.

My wordpress is behind a loadbalancer and I’m only seeing loadbalancer’s IP’s in my auth.log (172.19.X.X)

I’ve added following line in my wp-config.php:
define(‘WP_FAIL2BAN_PROXIES’, [‘172.19.0.0/16’]);

Unfortunatly, it doesn’t work.
Loadbalancer’s IP still appears in my auth.log and proxy IP list is empty in wp-fail2ban setting page.

Technical informations:
Debian 9.9
PHP7.3
Wordpress 5.1.8
WP fail2ban 4.3.0

Thanks.