Brute Force Attack, are a way hackers used to keep trying to login to the admin panel by guessing the username and password. If you do not have a strong password, it will be easily guessed by hackers, for them to login to your admin panel. Do not use the “admin” or “administrator” as the username.
Besides setting up a strong password, installing the plugin will help in preventing the attack. We will recommend few plugins as below.
Brute Protect
BruteProtect is a security plugin that guards against botnets by connecting its users to track every failed login attempt across all installed users of the plugin. When an IP has too many failed attempts in a specific period of time, BruteProtect logs and blocks that IP across the entire BruteProtect network (your site included).
https://wordpress.org/plugins/bruteprotect/
Limit Login Attempts
Limit Login Attempts blocks an Internet address from making further attempts after a specified limit on retries is reached, making a brute-force attack difficult or impossible.
https://wordpress.org/plugins/limit-login-attempts/
Login LockDown
It will limit the maximum login retries to three and once somebody goes over that limit, time period restrictions come into effect, starting with a 5 minutes delay before the next try is possible, delays keep growing until you are finally totally locked out for one hour.
https://wordpress.org/plugins/login-lockdown/
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