Fail2ban

Log-watching daemon that bans addresses after repeated authentication failures.

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About Fail2ban

Fail2ban tails log files, matches failure patterns with per-service filters and adds firewall rules to block the offending address for a configurable period. Jails ship for SSH, web servers, mail servers and many applications, and actions can notify as well as ban.

Strengths

  • Cuts SSH and web brute-force noise dramatically with one jail enabled
  • Filters and actions are plain configuration files, easy to extend

Limitations

  • Regex-based log parsing breaks when a service changes its log format
  • Only reacts after failures are logged; it is not a preventive control

Details

Pricing
FreeThe open-source software is available without a license fee. Hosting, hardware and external services are separate.
License
GPL-2.0
Developer
The Fail2ban contributors
Platforms
Linux, Self-hosted, Command line
How it runs
Self-hosted
Best suited for
Log-watching daemon that bans addresses after repeated authentication failures
Categories
Security tools
Last verified
Added
Provenance
Selected from the TechWalrus Resource Hub (Self-Hosting & Homelab); facts checked against the developer's own pages, 3 sources on file.

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