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Stay Ahead With Linux Security HOWTOs

Reduce Attack Surface Of Public Linux Servers Hero Esm H350
How to Secure My NetworkPrice Tag 1network 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...
1 min read How to Secure My Network
How To Remove Malicious Cron Esm H350
How to Secure My NetworkPrice Tag 1security 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...
5 - 9 min read How to Secure My Network
7.Locks HexConnections Esm H350
How to Secure My NetworkPrice Tag 1access 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...
6 - 12 min read How to Secure My Network
Detect Unauthorised Ssh Keys Hero Esm H350
How to Secure My NetworkPrice Tag 1security 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...
4 - 7 min read How to Secure My Network
IDS VS IPS Esm H350
How to Secure My NetworkPrice Tag 1intrusion detection application security

The wrong IPS rule can look like a security fix right up until it becomes an outage. . On Linux systems, detection and prevention are often discussed together, but they do not carry the same operational risk. One tells admins that something suspicious happened. The other can decide whether traffic is allowed to continue. That is why IDS vs IPS is not just a definition to memorize. It is a deployment decision about where to monitor, where to block, and how much confidence a team needs before...
4 - 8 min read How to Secure My Network
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19.Laptop Bed Esm H240
Price Tag 1command fixsoftware installationubuntu

Resolving 'Add-Apt-Repository: Command Not Found' Error on Ubuntu

A lot of users bump into the "add-apt-repository: command not found" error when adding repositories on Ubuntu/Debian. Here's how you can fix it. . Installing software on Linux systems is usually easy—often requiring no more than a single terminal command. But when you try to add a new repository for the first time, you may encounter the error, "add-apt-repository: command not found". Here's what that means and what you can do about it. Software is usually managed on Debian-based Linux systems via APT (Advanced Package Tool). You can use APT to search, install, update, or remove packages from a user's system. These packages are stored in repositories , which are huge software collections on remote systems. . Resolving the "add-apt-repository: command not found" issue in Ubuntu requires straightforward actions for effective repository management.. Ubuntu Repository Fix, Add APT Command, Software Installation Error, Linux Command Management. . Brittany Day

Calendar 2 Sep 30, 2022 •User Avatar Brittany Day How to Learn Tips and Tricks
News Add Esm H240

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[{"id":483,"title":"Self-taught through trial and error","votes":552,"type":"x","order":1,"pct":78.63,"resources":[]},{"id":484,"title":"Formal training or courses","votes":30,"type":"x","order":2,"pct":4.27,"resources":[]},{"id":485,"title":"A job that required it","votes":34,"type":"x","order":3,"pct":4.84,"resources":[]},{"id":486,"title":"Other","votes":86,"type":"x","order":4,"pct":12.25,"resources":[]}] ["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"] ["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"] 350
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