Tom, start by hardening the server (I know this isn't pf specific but, it
needs to done)

Link for hardening FreeBSD -
http://www.bsdguides.org/guides/freebsd/security/harden.php. Enable the
"configure FreeBSD to drop SYN/FIN packets:" and monitor the results.

Drop known garbage using Pf eg:

block drop in quick from <garbage> to any


Ports to look into - lockdown and mod_security. I use the denyhost database
to drop any connections from the list for a 24 hr period.

Regards

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