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When considering WordPress firewall plugins, it is important to consider not only the protection they can provide, but also whether they cause unnecessary problems. On both counts, the most popular security-only WordPress plugin, Wordfence Security, does worse than other options. As an example of the latter element of that, recently someone reported having functionality of their website not work with Wordfence Security enabled:
We upload our newsletter HTML to the media library for distribution. [Read more]