I have some typing mistakes on my previous post:
... your IP has been temporary blocked your the plugin.
... your IP has been temporary blocked by the plugin.
which also happen on my site, the plugin is looking for a file on wp-content directory,
which also happen on my site, another plugin is looking for a file on wp-content directory,
This IP blocking if looking for missing files feature can be configured on Better WP Security on section: Intrusion Detection. Please pay attention on the red colored text there. Here I make a copy:
Warning! If your site has a lot of missing files causing 404 errors using this feature can ban your own computer from your site. I would highly advice whitelisting your IP address below if this is the case.
To avoid such blocking happen on yourself, you should provided the IP of your webhost and the IP of the computer on the 404 White List. Unfortunately most home users won't have a fix IP address.
To know why 404 errors generated, you can examine it on View Log section. Some plugins on my site are not properly write to access 'wp-content', I know it from the log.