I have seen our previous forum bsdforums.org being attacked by bots creating phony user accounts. At one moment there were over 5000 of those bots online. The forum was slow, but didn't crash.
That is why I recommended to use Vbulletin.
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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