The LFD (Login Failure Daemon) is a part of ConfigServer security & firewall (CSF). It checks for the potential threats to a server. The Login Failure Daemon is used to increase the server security. If the user or someone tries to access the server with wrong password too many times in a row, then the server will automatically block the IP. The Login Failure Daemon can monitor the most commonly abused protocols such as IMAP, FTP, SSHD, POP3, and HTTP for password protection. Unlike the other applications,  LFD is a daemon process that monitors the logs continuously and reacts within seconds for detecting such attempts. It also monitors across protocols, so if attempts are made to different protocols in a short space of time, all those attempts will be counted against the threshold.

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