I have similar problem:
fail2ban does not detect / bans the follwing entries in
/var/log/apache2/error.log
[Tue Aug 25 16:10:51.646091 2015] [access_compat:error] [pid 4791] [client
77.252.213.157:4966] AH01797: client denied by server configuration:
/var/www/wp-login.php
[Tue Aug 25 16:13:58.386702 2015] [access_compat:error] [pid 4789] [client
52.18.200.197:65451] AH01797: client denied by server configuration:
/var/www//wp-login.php
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https://bugs.launchpad.net/bugs/1391723
Title:
Fail2ban not detecting ...client denied by server configuration...
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