Banned visitors are served a custom message instead of your site. You can ban by IP address, IP range, host name, user agent or referrer URL, exclude specific addresses from ever being banned, and see how many times each banned visitor has tried to get in. Wildcards are supported throughout. Everything is configured under Settings -> Ban, on three tabs: Stats for the attempt counters, Settings for the ban lists and the visitor IP options, and Templates for the banned message. The plugin will not let you ban the address, host name or user agent you are currently browsing with, so a wildcard...
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