What is BFD:
Brute Force Detection (BFD) is a more important and a critical part to protect your operating server from the dangerous malicious attack. The main and most common type of brute force attack is mainly a dictionary attack. If a malicious user who tries to get the access to your accounts like the web server, email, FTP and Ssh etc. and uses the files contain dictionary words to make an attempt to the rapid logins.
This dictionary file mainly contains the list of the usernames and the passwords, script or programs which use the dictionary file to make an attempt to the rapid fire logins which is against your server while using the one or more than one services which are mentioned above.
How BFD work for the Windows and Linux services?
Wide varieties of services which are on your server mainly maintains the log files that actually not result in the login attempt failed. BFD mainly works by the watching of the various log files which are failing in the login attempts and sometimes if it detects many of them in a short interval of time in a same source of the IP address then it will immediately block the IP address which is in the server’s firewall.
To summarize this BFD mainly stops the people from assuming the passwords which you have with some massive dictionary lists and after that it prevents them from making connections to the servers by just blocking all the current IP address which is in your server's firewall.
BFD for the Linux Servers:
C panel running Linux servers have already installed BFD. To view this or to modify the settings of the BFD just log on to your WHM and search the navigation link in the left called as the Security Center. After that, simply click on the cPHulk Brute Force Detection tab and that’s it.