No application can be considered completely secure. Majority of them have flaws and weak areas, leaving doors open for security threats. You can opt for various solutions to secure your data. One of the most well-known ways is by using Fail2Ban.
The obvious definition of this application includes monitoring the logs of common services and looking for malicious signs. It scans the log files and automatically bans the IPs with suspicious activity (e.g. a large number of failed login attempts) . These might include exploitations, password failures, etc.
Another Fail2Ban feature is to update the firewall rules. It comes with various filters, including apache, ssh, courier, etc. Each of them serves a different purpose and can be configured.
Now that you know what Fail2Ban is, let’s see how to use Fail2Ban to secure your server. Check this comprehensive Fail2Ban configuration guide: