Wordfence Security is a free enterprise class security and performance plugin that makes your site up to 50 times faster and more secure.
My website was hacked and I hired someone to come in and fix it. He installed Wordfence for me and I love it. I can block people who try to log in multiple times with failures, can see the activity of each page and which is human activity and what is bot activity. Plus it sends me an email every time someone logs in so I know if there is an issue (you can choose when it alerts you). No problems since Wordfence was installed. Great plug in.
Greate tool to scan hacked files and alert you the admin logged in from any where.
Warns and protects your site for hackers and other threads. A recommendation for every site.
Supergreat plugin that finds and protects hacked WP installations. It can also throttle botnets brute force attacks and block IP:s that has tried to login to the site.
Recommend it to everyone even if you haven't experienced a hacked site (yet). Well worth the money.
Very helpful mails from the mailing-list.
Wordfence is a great plugin and I choose to use it with every install I implement for clients. The plugin has solid support, works as it should and the developers keep their plugin users up to date with improvements and other threats to my sites.
Very nice plugin, which offers useful options.
Webmaster, Nos Progressus
Been using this plugin for a while now. It's a decent firewall for identifying visitors and possible malicious drive-bys, invalid login attempts by hackers, etc. Paired with Cloudflare, it does a pretty admirable job of securing web sites. Though it has its quirks and some places it could be improved... Overall, pretty happy with it. More feature-rich than many other similar firewalls. Certainly worth looking into if you don't have any site security plugin(s).