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How to Find Active SSH Connections on Linux

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With the different methods of finding active SSH connections on Linux examined in this guide, you can easily monitor who is logged in to your server.

Brittany Day
May 18, 2020

How to properly secure sysctl on Linux

Protecting Linux servers against SYN attacks and IP spoofing is surprisingly simple. Jack Wallen shows you how in a great tutorial.

Brittany Day
May 08, 2020

Monitor And Administer Linux Servers Using Cockpit Via Web Browser

Cockpit is a free, open source, server administration tool that allows you to easily monitor and administer Linux servers via a web browser. Learn how to install and configure Cockpit on Linux in a helpful tutorial.

Brittany Day
May 06, 2020

How to check for weak passwords on your Linux systems with John the Ripper

Are you certain that your end users are utilizing strong passwords on your Linux servers? Let a tool called John the Ripper (JTR) show you who is and who isn't. Learn how this is done in a helpful tutorial.

Brittany Day
May 01, 2020

How to prevent unattended SSH connections from remaining connected

Preventing idle SSH sessions from remaining connected is critical in keeping servers secure. Find out how to do this in a helpful tutorial.

Brittany Day
Apr 28, 2020

How to Enable/Disable Ping using iptables on Debian 10

In a production environment, it is common practice to disable network ping for a security reason so that no one can ping your server. However, by default, ping is enabled on Linux servers. Learn now to enable and disable Ping using iptables on Debian 10 in a helpful tutorial:

Brittany Day
Dec 20, 2019

How to Keep Your Web Servers Secure

The good news is that Web servers have come a long way in terms of security. But to err is human, even for IT and security people.

Brittany Day
Aug 05, 2019

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Simple Cloud Hardening

Want to learn how to apply a few basic hardening principles to secure your cloud environment? This article does a great job of simplifying the server-hardening process for Cloud infrastructure.

Brittany Day
Jul 10, 2019

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How to Secure and Harden Cloud/VPS VM (Ubuntu/CentOS)?

Are you a CentOS or Ubuntu user who wants to learn how to secure your Cloud/VPS VM? Some tips and best practices for securing your Cloud server include changing SSH default ports, disabling password-based authentication and performing regular backups and updates.

Brittany Day
Jul 10, 2019

How to secure your Linux cloud server

Looking for tips on how to secure your Linux cloud? Linux offers many options for hardening your system and preventing unauthorized access. Some best practices for making sure your Linux cloud remains secure include encrypting communications, monitoring login authentication, using SSH-keys instead of passwords, setting up a firewall, updating your system, frequently scanning for malware and implementing an intrusion detection system.

Brittany Day
Jul 10, 2019

Getting started with OpenSSL: Cryptography basics

This article is the first of two on cryptography basics using OpenSSL, a production-grade library and toolkit popular on Linux and other systems. (To install the most recent version of OpenSSL, see here.) OpenSSL utilities are available at the command line, and programs can call functions from the OpenSSL libraries. The sample program for this article is in C, the source language for the OpenSSL libraries.

Brittany Day
Jun 19, 2019

Linux Server Hardening Using Idempotency with Ansible: Part 3

In the previous articles, we introduced idempotency as a way to approach your server’s security posture and looked at some specific Ansible examples, including the kernel, system accounts, and IPtables. In this final article of the series, we’ll look at a few more server-hardening examples and talk a little more about how the idempotency playbook might be used.

Brittany Day
Jun 16, 2019

Are Your Linux Servers Really Protected?

When thinking about IT security, one area that may not readily come to mind is the physical security of an enterprise’s servers. It’s often thought that because the servers are behind lock and key and/or in a data center, and because the data is in continuous use, encrypting the server drives isn’t needed since the data is never at-rest.

Brittany Day
Jun 12, 2019

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Using Testinfra with Ansible to verify server state

By design, Ansible expresses the desired state of a machine to ensure that the content of an Ansible playbook or role is deployed to the targeted machines. But what if you need to make sure all the infrastructure changes are in Ansible? Or verify the state of a server at any time?

Brittany Day
May 17, 2019

Linux Server Hardening Using Idempotency with Ansible: Part 1

I think it’s safe to say that the need to frequently update the packages on our machines has been firmly drilled into us. To ensure the use of latest features and also keep security bugs to a minimum, skilled engineers and even desktop users are well-versed in the need to update their software.

Brittany Day
Apr 11, 2019

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How to Install LDAP Account Manager on Ubuntu Server 18.04

Welcome back to this three-party journey to getting OpenLDAP up and running so that you can authenticate your Linux desktop machines to the LDAP server. In part one, we installed OpenLDAP on Ubuntu Server 18.04 and added our first LDAP entries to the directory tree via the Command Line Interface (CLI).

Brittany Day
Apr 03, 2019

Protect Your Websites with Let's Encrypt

Back in the bad old days, setting up basic HTTPS with a certificate authority cost as much as several hundred dollars per year, and the process was difficult and error-prone to set up. Now we have Let's Encrypt for free, and the whole thing takes just a few minutes.

Brittany Day
Jan 20, 2019

Securing your VNC connection using SSH

VNC stands for Virtual Network Computing. It is remote control software which allows you to view and fully interact with one computer desktop using a VNC viewer on another computer desktop anywhere on the LAN or Internet. There are many facets of ensuring your VNC is secure and this article shows you how to do it with a Linux (OpenSuse 10.3) server. This is a great step-by-step way to establish a quick secure way to access remote desktops with SSH.

LinuxSecurity Contributors
Dec 12, 2007

HowTo: Prevent a Fork Bomb Attack

Fork bombing attacks, like other dangers, can wreak havoc on a system if you aren't careful. Every angle that isn't covered could in fact be the most vulnerable resource to a potential cracker. Here you get a quick overview on what needs to be done to make the most of your protection: Limiting user processes is important for running a stable system. To limit user process just add user name or group or all users to /etc/security/limits.conf file and impose process limitations.

LinuxSecurity Contributors
Nov 27, 2007

Enable Multiple HTTPS Sites For One IP Using TLS Extensions

If you need to set up secure website connections, this HOWTO is what you need. IT's focused on Debian but will help no matter what distribution you may be using. This how-to is Debian specific but could be ported to other distributions since the concept is the same. In order to use TLS Extensions we have to patch and recompile apache2 and recompile OpenSSL with the enable-tlsext directive. If you are going to use this HOWTO, you may want to check out their "Perfect Debian" HOWTO as well.

LinuxSecurity Contributors
Nov 16, 2007

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