How to Protect Your Linux Distribution Against Unauthorised Access
Firewall, updates, proper sudo use and secure SSH.
Linux has a solid security reputation, but it isn't invulnerable by default — these specific steps make a real difference.
1. Active firewall
Set up UFW with a basic policy of denying incoming, allowing outgoing.
2. Strong, unique password
Your user account (and especially the administrator one) deserves a password you don't reuse anywhere else.
3. Keep the system updated
Updates include real security patches — delaying them indefinitely increases your exposure to already known and fixed vulnerabilities.
4. Use sudo, not the root account directly
We cover why in this article — it reduces the margin for error of commands with full permissions.
5. If you use SSH, protect remote access
- Use key-based authentication instead of just a password.
- Consider changing the default port (22) to reduce noise from automated scans.
Tip: no single measure is enough on its own — it's the combination of several layers (firewall, updates, strong passwords, good sudo practices) that gives real, reasonable protection for home use.
Frequently asked questions
Do I need an antivirus on Linux?
For normal home use, it isn't as essential as on Windows — Linux's permission design and the lower volume of targeted malware make it less critical, though an active firewall and good practices remain important.
What's the most important security measure to start with?
Keeping the system updated and having an active firewall are the two most important foundations — they cover most known vulnerabilities without needing complex configuration.