atmosphear

Send an “HTTP/1.1 403 Forbidden” header on a failed login instead of “HTTP/1.1 200 OK”, which is the WordPress default header on failed login. This is a tremendously simple plugin that does only that and absolutely nothing else.
The purpose of this plugin is to provide a way to allow external tools like fail2ban to get a message of a failed login e.g. to prevent a brute-force attack on a firewall level.
For the public domain.
Uses PHP5.3 anonymous functions and will not work on earlier versions of PHP

HTTP/1.1 403 Forbidden header on a failed login

Send an "HTTP/1.1 403 Forbidden" header on a failed login instead of the default "HTTP/1.1 200 OK"

invisnet

No matter how good your anti-spam measures, some will get past. This add-on logs spam form submissions via <a href="https://wordpress.org/plugins/wp-fail2ban/" rel="ugc">WP fail2ban</a>, and provides a new filter for <code>fail2ban</code>.

WP fail2ban Add-on for Gravity Forms

WP fail2ban integration with Gravity Forms to log spam form submissions.

HTTP/1.1 403 Forbidden header on a failed login vs WP fail2ban Add-on for Gravity Forms