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How to Secure My Network
incident response open-source
incident response open-source When a production server spikes at 99% CPU or the disk starts grinding, the knee-jerk reaction is usually to blame a bad code push or a runaway backup job. But if you’ve spent enough time in security incident response, you know that "performance issues" are often the first sign that you’re dealing with Linux malware. . If you don't have a systematic way to look past the performance graphs, you’re just guessing. Here is how you use Linux commands to peel back the layers when a system starts...
Jun 23, 2026 
How to Secure My Networknetwork security Linux administration
network security Linux administration Open ports have a way of accumulating over time. A test environment gets deployed and never removed. An administrative interface is exposed for troubleshooting and left in place. A database that was supposed to listen internally ends up reachable from the internet. . Attackers look for these mistakes constantly. Redis, Elasticsearch, MongoDB, Jenkins, and similar services still show up on internet-facing systems where they were never meant to be exposed. Sometimes it's a temporary change that...
Jun 10, 2026 
How to Secure My Networksecurity advisory intrusion detection
security advisory intrusion detection A compromised Linux server can continue running malware long after the initial intrusion. One of the most common persistence techniques is a malicious cron job that silently downloads payloads, restarts malware, or re-establishes attacker access every few minutes. This guide shows how to identify suspicious cron entries, preserve forensic evidence, remove unauthorized scheduled tasks, and verify that no additional persistence mechanisms remain. . What Should You Save Before Removing Cron Jobs...
Jun 09, 2026 
How to Secure My Networkaccess control Linux administration
access control Linux administration Most SSH hardening advice ends at the same recommendation: Disable password authentication and use SSH keys. . That's good advice. It removes entire classes of attacks, including password spraying, credential stuffing, and brute-force attempts against exposed servers. The problem is what happens next. Many administrators treat SSH keys as the finish line when they are really the beginning of the hardening process. Attackers rarely care whether they obtained access with a password or a private...
Jun 05, 2026 
How to Secure My Networksecurity advisory remote access
security advisory remote access Most of the time, nobody notices. SSH authentication succeeds, no alerts are generated, and the connection looks exactly the way it did the day the key was installed. That's part of the problem. . When security teams investigate unauthorized access on Linux systems, they often focus on passwords, exposed services, or vulnerable software. Trusted access receives less attention. Yet a single forgotten or unauthorized SSH key can provide the same access as a legitimate user while attracting very...
Jun 03, 2026 
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data privacyprivacy toolapplication firewallHow to Install Portmaster: Control Data Privacy on Linux
The modern user is a privacy conscious one. We want to know what data is being collected and how it’s being used. For Linux users, we embody this mindset ten-fold. Portmaster gives you more control over your data. . Portmaster is an open-source application firewall. It allows you to analyze and control the network activity of individual applications. You can also see which IP addresses data is traveling to and from, allowing you to detect any services that are siphoning your data. The paid tier, Portmaster unlimited, gives you access to a VPN alternative: an SPN (Safing private network). A traditional, packet-filtering firewall is port-based. When you enter the port, the firewall will prevent all Internet traffic from flowing through it. An application-level firewall, like Portmaster, protects you from both ends. It provides you with a level of user anonymity and finer controls. Although there are more complex solutions that provide next-level security, these are often not consumer grade and are more data center oriented. . NetGuardian equips Linux enthusiasts with tools to monitor network operations and bolster information security through its community-driven firewall application.. Portmaster, Application Firewall, Data Privacy, Linux Network Control. . Brittany Day
Nov 19, 2022 •
How to Strengthen My Privacy 
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