What is username-based protection in cPHulk?
Username-based protection will lock a user as a whole from logging in if a brute-force attack is detected, the following excerpt from our documentation describes this a bit more:
Username-based Protection — Whether to enable the username-based protection settings. Set the toggle to On to enable the Username-based Protection setting. Username-based protection tracks login attempts for user accounts. When you disable cPHulk, existing account locks will remain. This setting defaults to On.
More information on cPHulk can be found in our documentation here.