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Stay Ahead With Linux Security HOWTOs

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...
1 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
8.Locks HexConnections CodeGlobe Esm H350
How to Secure My NetworkPrice Tag 1unauthorized access security techniques

Exposed SSH servers are continuously hammered by brute-force attacks, password spraying, credential stuffing, and recycled passwords from infostealer dumps. Attackers rotate usernames, test weak credentials, and probe for anything that gives them initial access. The logs usually look messy long before the compromise happens. . The difficult part is separating harmless failures from actual intrusion activity. One failed login from an internal workstation rarely matters. Repeated failures...
5 - 9 min read How to Secure My Network
7.Locks HexConnections Esm H350
How to Secure My NetworkPrice Tag 1security advisory incident response

The first 30 minutes after discovering a compromised Linux server usually decide how much evidence remains available. One rushed reboot or cleanup attempt can wipe logs, terminate malicious processes, or remove network activity that investigators still need to review. Attackers also do not usually stay on one system for long once access is established. Early response is mostly about preserving visibility. Collect process information. Save network connections. Limit access carefully before...
6 - 11 min read How to Secure My Network
How To Diagnose Suspicious Outbound Connections On Linux Servers Hero Esm H350
How to Secure My NetworkPrice Tag 1network monitoring Linux server

When a Linux server initiates an unauthorized outbound connection to an unknown IP address, it rarely triggers an immediate system failure. Instead, the server continues running normally, and the connection is usually only discovered during a routine firewall log review, a DNS audit, or a post-incident investigation. Because there are no obvious system crashes or performance drops, these quiet outbound sessions can easily be overlooked. . However, treating these anomalies lightly is a...
6 - 11 min read How to Secure My Network
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33.EmailsTraveling Esm H240
Price Tag 1debianpostfixmail transfer agent

Configuring Postfix on Debian for Effective Email Delivery

Postfix is one of the best mail transfer agents for Linux servers. Here's how you can configure a Postfix server installation on Debian. . E-mail is one of the most basic messaging methods used since the development of the internet. This has led to the development of many messaging tools and protocols. There are protocols for the compatible operation of systems with different architectures. E-mail servers perform tasks such as not losing user e-mails, and assisting users in accessing their e-mails when they're online. The tools that provide e-mail transmission on local intranets and the internet are called Mail Transfer Agents (MTA). . In the current digital era, email remains a vital tool. Discover the steps for setting up a Postfix mail server on a Debian system to enhance your messaging capabilities.. Postfix Mail Server, Debian Setup, Mail Transfer Agent. . Brittany Day

Calendar 2 Feb 11, 2023 •User Avatar Brittany Day How to Secure My E-mail
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[{"id":483,"title":"Self-taught through trial and error","votes":545,"type":"x","order":1,"pct":78.42,"resources":[]},{"id":484,"title":"Formal training or courses","votes":30,"type":"x","order":2,"pct":4.32,"resources":[]},{"id":485,"title":"A job that required it","votes":34,"type":"x","order":3,"pct":4.89,"resources":[]},{"id":486,"title":"Other","votes":86,"type":"x","order":4,"pct":12.37,"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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