In a previous guide, we discussed how to get fail2ban up and running on Ubuntu 14.04. Luckily, services like fail2ban were created to help us mitigate these attacks.įail2ban works by dynamically altering the firewall rules to ban addresses that have unsuccessfully attempted to log in a certain number of times. If your service requires authentication, illegitimate users and bots will attempt to break into your system by repeatedly trying to authenticate using different credentials.Ī common example of this is with SSH, which will be the subject of bot attacks that attempt to brute force common account names. Any service that is exposed to the internet is susceptible to attacks from malicious parties.
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