failed_access_blocker 08 December 2010 / Updated: 20 April 2013
Hackers often use "probing" or "password guessing" to attempt to breach your site This plugin can help to throttle these attacks. It works by monitoring failed logon attempts. If a defined threashold is exceeded by requests from a particular IP address, further access attempts from that IP accress will be ignored until a timeout has expired.
This extension is officially supported but not included in the ZenphotoCMS release.