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There is some cookie in this plugin that causes sucuri firewall (and caching) to block an admin out.
Sucuri offers to whitelist the IP, but this is not much help for other PCs or network connections that may be used at any time in future.
Better to avoid the cause (by default) in the first place.
Better to detect if the problem may arise, before committing any setting that may cause it (so have a “test” function.
Have option to use the setting after measures to avoid problems have been done (so they don’t need to be done after).
Build these features in to the plugin, and save a lot of diagnosis, emailing, forum time, downtime, etc, for everybody.