Nobody has mentioned Captchas, apparently there are number of applicable CPAN Modules. I think they are the most effective method for both avoiding lockout situations and making brute force attacks prohibitively expensive. Can anybody vouch for any of the modules?

They're not particularly effective since they only have a chance of stopping automated brute force attacks. Not man-in-the-middle variants or, attackers with partial information.

In reply to Re^2: Why do you have to worry about Brute Force Attacks? by adrianh
in thread Why do you have to worry about Brute Force Attacks? by Anonymous Monk

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