Using another plugin also

Using multiple firewall plugins can sometimes cause problems, so it is generally best to use only one plugin for this.

There are a number of firewall options and login security options to choose from in Wordfence that you can learn about here:
http://docs.wordfence.com/en/Wordfence_options#Firewall_Rules
and here:
http://docs.wordfence.com/en/Wordfence_options#Login_Security_Options

The default settings will work for most sites, if you don’t want to customize them.

-Matt