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Home How to

Protect Your SSH From Bruteforce With Fail2Ban

Chankey Pathak by Chankey Pathak
July 10, 2020
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Today I will be showing you how to enable Fail2Ban. One of the features of Fail2Ban is that it will automatically block anyone that fails to login to your ssh 5 times for 10 minutes by default although you can change this.

This will pretty much put an end to people being able to bruteforce your root password through ssh. You really should setup keys for ssh authentication which is something that I will be doing/explaining in another guide.

Installing Fail2Ban On Your Server

Let’s get started by installing Fail2Ban. You can actually install it with just one command and the default settings should do the trick.

Ubuntu / Debian

sudo apt-get install fail2ban && service fail2ban status

Fedora / Cent OS / Red Hat

sudo yum install epel-release
sudo yum install fail2ban && service fail2ban status

Checking For Failed SSH Attempts

If you want to see how many failed ssh attempts there have been then you can run the following command.

grep sshd.\*Failed /var/log/auth.log

You should see a response something like this (the list is extremely long for this droplet so I will shorten it).

root [10:04:14] ~ > grep sshd.\*Failed /var/log/auth.log | tail
June 30 09:49:46 chankeypathak sshd[17228]: Failed password for invalid user admin from 111.198.24.196 port 49454 ssh2
June 30 09:50:41 chankeypathak sshd[17248]: Failed password for root from 116.31.116.28 port 62627 ssh2

I hope you enjoyed this quick guide, if you have any comments then feel free to post them below! =)

Tags: how tosecurityssh
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Chankey Pathak

Chankey Pathak

Data Scientist at Morgan Stanley. I've been using Linux since past 12 years. I plan to share what I know about Linux in this blog.

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