Archive for the “Security” Category

What Is SPF – And Why It Is Essential If Your Server Handles Email

by Hayden Smith

One of the biggest issues with email has always been how vulnerable it is to spoofing, with the mail client and server trusting the input given by the user for identification of the sender. Spammers often abused this to send email giving the impression that it came from a reputable source. A solution was needed…

Basic Server Security – Detecting And Protecting Against Vulnerabilities

by Hayden Smith

Welcome to the final part of our series on basic server security. Over the course of the series we’ve covered almost everything you need to know about securing a server, so if this is the first part you’ve seen, it is well worth looking back over the others. As we’ve covered in a previous article,…

Basic Server Security – The Importance Of Updates

by Hayden Smith

Welcome to another article in our series on basic server security. We have covered much of what you need to know so far, but this time it’s the turn of software updates. Software gets updated all the time, some with defined update intervals such as Microsoft’s products with its “patch Tuesday” release schedule, and others…

Basic Server Security – What Are SSL/TLS And Why Are They Important

by Hayden Smith

If you’ve been working with websites or servers for a while, you’ll likely have seen references to SSL certificates and TLS. In this part of our Basic Server Security series we’ll be looking at what they are and why they are important to your server. Security risks One of the features of the early internet…

Basic Server Security: Auditing And Managing Running Services

by Hayden Smith

Welcome back to our series on basic server security. So far we’ve looked at the reasons why your server needs to be secured, how to use your firewall, monitoring and intrusion detection tools that can help with this, and also why you need to use multiple user accounts with your server. In this article we’ll…

Basic Server Security – System Monitoring And Intrusion Detection Systems

by Hayden Smith

Welcome back to our series on basic server security. Previously we’ve looked at why you need to secure your server, using a firewall to help secure it, and the importance of using multiple users and access controls. In this article we’ll be looking at system monitoring and intrusion detection. System Monitoring System monitoring tools are…

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Basic Server Security – The Importance Of User Access Controls

by Hayden Smith

On most operating systems, the first user created is intended for system administration tasks. On Windows this user is usually called Administrator, and on Linux it is called root. A mistake often made by new server administrators is to use these administration accounts for all tasks, which can cause potential security risks. Most server platforms…

Basic Server Security: Firewalls

by Hayden Smith

One of the first layers of defence against attackers and unauthorized access to your server is a firewall. A firewall analyzes the network traffic on your server and makes decisions as to which traffic should be allowed to pass or which traffic should be stopped. How Do Firewalls Work? The firewall’s decisions are normally driven…

Basic Server Security: A Threat Overview

by Hayden Smith

One of the first recommended tasks with a new server is to secure it. In this coming series on basic server security we’ll be looking at a number of the techniques and methods you can use to secure your server and help keep it protected from threats. To begin, we are going to look at…

Protecting SSH With Denyhosts

by Hayden Smith

SecureSHell (SSH) is one of the most important tools on a Linux server, and can  be managed remotely from anywhere with an internet connection. Unfortunately, because a user with access to a server via SSH can have full control of that server, this makes SSH a common target for hackers to attack. Restricting IP Addresses…

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