How to Protect Your SSH Server With Fail2Ban [Linux/Ubuntu]

1. How do I protect SSH with fail2ban?
2. How do I stop fail2ban service?
3. What is fail2ban Ubuntu?
4. Do I need fail2ban?
5. How do I check if fail2ban is working?
6. What is Fail ban?
7. How do I restart fail2ban service?
8. How do I know if IP is fail2ban banned?
9. How do I configure fail2ban?
10. Is fail2ban safe?
11. How do I harden my Ubuntu server?
12. What is Findtime in fail2ban?

How do I protect SSH with fail2ban?

A good way to protect SSH would be to ban an IP address from logging in if there are too many failed login attempts.
...
The basics of Fail2ban

1. Filters specify certain patterns of text that Fail2ban should recognize in log files.
2. Actions are things Fail2ban can do.
3. Jails tell Fail2ban to match a filter on some logs.

How do I stop fail2ban service?

The "stop" suggestion from IgorG will completly stop fail2ban. If you didn't configure automatic restarts for the fail2ban service, it will be stopped upon your next server restart. Optional you can try to restart the fail2ban service with "service fail2ban start" ( or "/etc/init.

What is fail2ban Ubuntu?

Fail2Ban is an intrusion prevention framework written in the Python programming language. It works by reading SSH, ProFTP, Apache logs etc.. and uses iptables profiles to block brute-force attempts.

Do I need fail2ban?

Fail2ban will still help, as it will block IPs repeatedly failing key-based authentication. In short, it's a bonus middle-finger to whoever is crossing the line. You can use F2B on virtually any service that requires authentication! ...

How do I check if fail2ban is working?

log if fail2ban has been started. You'll also see output related to fail2ban activity. If you installed failed2ban via the package manager or software center, you should see entries in the /etc/rc* directories for fail2ban, which indicate (on default settings and without customization) that it will run on startup.

What is Fail ban?

Fail2Ban is an intrusion prevention software framework that protects computer servers from brute-force attacks. Written in the Python programming language, it is able to run on POSIX systems that have an interface to a packet-control system or firewall installed locally, for example, iptables or TCP Wrapper.

How do I restart fail2ban service?

Now we can restart the fail2ban service using systemctl : sudo systemctl restart fail2ban.

How do I know if IP is fail2ban banned?

On the protected system (192.168. 1.83), tail the /var/log/fail2ban. log to see any current ban actions. You can see that the IP address 192.168.

How do I configure fail2ban?

Configuring fail2ban

1. Log in to your server using SSH.
2. At the command prompt, type the following command: cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local. ...
3. Open the jail. ...
4. Locate the [DEFAULT] section, which contains the following global options: ...
5. Save your changes to the jail.

Is fail2ban safe?

It's important to note that fail2ban is just a small part of a full server security program. It's not a replacement for using secure passwords or hardening the server by limiting the number of exposed services. Nevertheless, if your server is plagued by automated bots, fail2ban is a great tool for limiting the impact.

How do I harden my Ubuntu server?

The following tips and tricks are some easy ways to quickly harden an Ubuntu server.

1. Keep System Up-To-Date. ...
2. Accounts. ...
3. Ensure Only root Has UID of 0. ...
4. Check for Accounts with Empty Passwords. ...
5. Lock Accounts. ...
6. Adding New User Accounts. ...
7. Sudo Configuration. ...
8. IpTables.

What is Findtime in fail2ban?

findtime: This parameter sets the window that fail2ban will pay attention to when looking for repeated failed authentication attempts. The default is set to 600 seconds (10 minutes again), which means that the software will count the number of failed attempts in the last 10 minutes.