Brute Force Detection (BFD) ...
is also an Open Source project created and maintained by RF-X Networks. Brute Force Attacks are attacks over common services such as SSH, FTP, and Mail to gain entry into a server. To “Brute Force” is to continuously try to login with different user names and passwords until one works. Often, small programs are written to perform this task multiple of times per second which not only can be a security risk (if you use weak passwords), but can affect overall sever performance. To compensate this, BFD logs failed logins on these common servers, and if too many are reached, the offending IP is banned by the APF firewall.
For more background information about BFD, visit the BFD Website.
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