If you have not set your Linux server/VPS (or workstation if you have the SSH service running) for public key authentication only (way quicker and more secure for later use), then this guide may be really useful. It is one of the easier-to-follow ones that I have seen.
It will help put in place a really basic and essential protection that any Linux server should have. Fail2Ban is a vigilant sentry for your servers. It is one of the most effective shields against unauthorized access attempts, especially brute force.
One of its most valuable things is it acts proactive. In other words, instead of waiting for an attack, Fail2Ban offers an approach by identifying and blocking potential threats in real time. The beauty of Fail2Ban lies in its simplicity and adaptability. Moreover, it is light on resources, so it doesn’t burden your server’s performance.
For any of my servers, straight after changing the admin password, the Fail2Ban service is the immediate next step on my list to activate.