Found a post on another forum..perhaps it will help..
"I removed the yum version. I feel 0.8.1 or so.
Installed 0.8.4 from sources, and default rule sets working now.
The date format is ISO 8601, hence the logs were not parsed correctly earlier."
Posted: Mon Jan 31, 2011 3:01 pm
Post subject: fail2ban centos ispconfig 3 problem solved.