Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×
Stay Ahead With Linux Security HOWTOs
How to Secure My Network
incident response network traffic
incident response network traffic Imagine logging into a production Linux server for routine maintenance and noticing background network activity connecting to an unfamiliar external IP address. Your endpoint protection agent is not popping up with an alert, there is no service failure, and on the surface, the system appears to be running normally. . For Linux administrators and security teams, such a situation is a moment of truth: Is this activity a sign of active intrusion or just a tool that was overlooked in the course of...
Jul 21, 2026
How to Harden My Filesystemsystem hardening open source security
system hardening open source security We all spend a lot of time defending our systems from external threats, but the amount of damage an attacker can cause often depends on what happens after they get in. A single compromised account doesn't always lead to a major incident. The real danger begins when that account has far more access than it actually needs. . That's exactly what the principle of least privilege is designed to prevent. By limiting users, services, and applications to only the permissions required for their jobs,...
Jul 20, 2026
How to Learn Tips and Tricksthreat detection system monitoring
threat detection system monitoring For small security and IT teams, the "enterprise" dream of a fully automated SIEM often feels like a distant luxury. It’s a vision built on massive budgets and dedicated engineering teams—things that, frankly, most of us don't have. But here is the reality: you don’t need a six-figure platform to maintain a secure environment. . Linux systems are, by design, incredibly verbose. Every time a user authenticates, a process executes, or a configuration file changes, your system creates a record of...
Jul 17, 2026
How to Learn Tips and Tricksnetwork security centralized logging
network security centralized logging Linux systems generate a steady stream of authentication, service, kernel, and application logs. On most systems, those logs never leave the machine that created them. If you're responsible for ten or twenty servers, that means checking each one separately. If one disappears before you can investigate it, its logs may disappear with it. Centralized logging solves that by sending log messages to another server as they're created. Instead of searching every machine, you have one place to review...
Jul 15, 2026
How to Secure My Networksecurity advisory audit
security advisory audit When you’re digging through an incident, your logs are the only thing you can actually trust. The problem is, attackers know that too. If someone gets root on your server, their first move is almost always to delete the evidence and cover their tracks. . If you aren't actively protecting your logs, you're basically flying blind the second a breach happens. It’s a miserable feeling to realize you have no idea what an attacker did because they wiped the logs before you even got there. In this...
Jul 11, 2026
Refine HOWTOs
X Clear Filters
Get the latest News and Insights
Get the latest Linux and open source security news straight to your inbox.
Community Poll
Should Linux servers automatically install security updates?
Loading...
Explore Latest Linux Security HOWTOs
We found -4 articles for you...
166
network securityfirewall rulesssh managementHow To Block IP Addresses In Linux With Hosts.allow And Hosts.deny
In this How to Make Tech Work tutorial, Jack Wallen shows how to add another layer of security to your Linux machines with just two files. . Did you know there’s a very easy way to block or allow IP addresses in Linux using two simple files? Those files are hosts.allow and hosts.deny, and they make it such that you can block or allow IP addresses on the fly without having to deal with more complicated firewall rules. With this ability, you could quickly block a suspicious IP address to avoid possible malicious activity; or, you could limit, say, SSH connections to only specific addresses so you don’t have to worry about third parties gaining access to your servers or desktops. Let me show you how it’s done by demonstrating SSH access to a machine. The only things you’ll need for this are a running instance of Linux and a user with sudo privileges. Log in to your Linux machine and open a terminal window. The first thing we’re going to do is deny all access to the SSH daemon. Open hosts.deny with the command sudo nano /etc/hosts.deny. At the bottom of that file, add sshd: ALL. Save and close the file. . Effortlessly manage access control for IP addresses on Unix-based systems via hosts.allow and hosts.deny, boosting your security protocols.. IP Blocking, Linux Security, SSH Management, Firewall Rules. . Brittany Day
Aug 11, 2023
•
How to Learn Tips and Tricks
Get the latest News and Insights
Get the latest Linux and open source security news straight to your inbox.
Community Poll
Should Linux servers automatically install security updates?
Search Topics
Powered By
Linux Security - Your source for Top Linux News, Advisories, HOWTOs and Feature Releases
QUICK LINKS
subscribe to newsletters!
Like staying secure? So do we.
Sign up for updates, tips, and alerts!