Improving Security for your Remote Desktop Connection

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Remote Desktop Protocol (RDP) is the easiest and most common method for managing a Windows server. Included in all versions of Windows server and has a built-in client on all Windows desktops. There are also free applications available for Macintosh and Linux based desktops. Unfortunately, because it is so widely used, RDP is also the target of a large number of brute force attacks on the server. Malicious users will use compromised computers to attempt to connect to your server using RDP. Even if the attack is unsuccessful in guessing your administrator password, just the flood of attempted connections can cause instability and other performance issues on your server. Fortunately, there are some approaches you can use to minimize your exposure to these types of attacks.

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How to Edit Your Hosts File in Windows 10

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What is a Hosts File?

The hosts file is a local plain text file that maps servers or hostnames to IP addresses. This file has been in use since the time of ARPANET. It was the original method to resolve hostnames to a specific IP address. The hosts file is usually the first process in the domain name resolution procedure. Here is an example of a hosts file entry.

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An Introduction to Firewalld

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In some ways, firewalld on systemd systems is easier to manage and configure than iptables. There are, for the most part, no long series of chains, jumps, accepts and denies that you need to memorize to get firewalld up and running in a basic configuration. The rules are simple and straightforward, but there is no reason you cannot still have all the power that iptables afforded.

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How to Decode DNS Zone Types

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What is a DNS Zone?

A DNS Zone is part of a group of components that make up DNS. These objects are managed by an administrator or organization in a granular manner. DNS zones can contain varied information about a domain and subdomains. Multiple zones can also exist on the same server.  DNS information is stored within a text file called a DNS zone file.

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Understanding the DNS Process

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What is DNS?

DNS stands for Domain Name System (DNS) services. When we access a website, we are using this service to locate the server where the domain’s website is located. When browsing the web, we usually type in a domain name like www.google.com into our browser. This is better than trying to remember an IP address linked to a Google server.

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How to Perform a Reverse DNS Lookup

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The purpose of DNS is typically used to resolve a domain name to an IP address. This act is known as a forward resolution and is performed every time you visit a site on the internet. Reverse DNS (or rDNS), as its name implies, is a method of resolving an IP address back to a domain name.

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How to Install and Configure Nmcli

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What is nmcli?

nmcli stands for Network Management Command-Line Interface, and is a tool for managing the NetworkManager application and reporting on the status of the network. It can be utilized as a substitution for nm-applet or other similar graphical clients. nmcli is used to display, create, delete, edit, activate, deactivate network connections, and control and display network device status.

Typical uses include:

  • Scripts: Utilize NetworkManager via nmcli rather than managing network connections manually. nmcli supports a terse output format that is healthier fitted to the script process. Note that NetworkManager can even execute scripts, referred to as “dispatcher scripts,” responding to network events.
  • Servers, headless machines, and terminals: nmcli tool can be used to control NetworkManager without a graphical user interface, including creating, deleting, editing, starting and stopping network connections as well as viewing network status.
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DNS: An Overview

Reading Time: 3 minutes

What is DNS?

The Domain Name Service (or DNS) is the key to the presence of your server on the internet. You are probably aware your domain has an “IP” address, which stands for Internet Protocol; that number is your domain’s literal web address on the internet. A typical IP address is a series of four numbers called octets that are identified like so: 10.10.10.10.  You can think of your IP address as being similar to a postal address. The IP address is the exact location where your domain lives. I usually explain it like this;

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How to Set Up A Firewall Using Iptables on Ubuntu 16.04

Reading Time: 5 minutesThis guide will walk you through the steps for setting up a firewall using iptables in an Ubuntu VPS server. We’ll show you some common commands for manipulating the firewall, and teach you how to create your own rules. Continue reading “How to Set Up A Firewall Using Iptables on Ubuntu 16.04”