How to Scan & Find All Open Ports with Nmap


The Nmap hosted security tool can help you determine how well your firewall and security configuration is working. This guide will show you how to scan or check your Linux system for open ports using Nmap.

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What is a Domain Name System (DNS) & How Does it Work?


Domain Name System (DNS) first emerged in the early 1980s. It represents a system of interconnected servers that store registered domain names and Internet Protocol (IP) addresses. As the Internet grew, it became an unavoidable part of online…

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How to Flush DNS Cache Locally in Windows, macOS, & Linux


DNS cache can be corrupted for a number of different reasons, including network attacks or viruses. When that happens, IP address mapping becomes corrupted for certain popular websites. Learn to clear DNS cache on your system and resolve potential…

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How to Set up & Use NGINX as a Reverse Proxy


Nginx (pronounced “Engine X”) is a reverse proxy application. A standard proxy server works on behalf of clients, often by providing privacy or filtering content. A reverse proxy works on behalf of a server, intercepting traffic and routing it to a…

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How to Edit Hosts File in Linux, Windows, or Mac


The hosts file in Windows, Mac, or Linux maps hostnames to IP addresses. This could be in an intranet, like a corporate office that has servers for users to access, or it could be domain names for servers on the internet.

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How to Set or Change a Hostname in CentOS 7


This technical guide is for users who already have a server running the CentOS 7 operating system on a network.

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How to Configure & Setup AWS Direct Connect


AWS Direct Connect establishes a direct private connection from your equipment to AWS. Use AWS Direct Connect to form a dedicated network between your physical hardware (e.g., colocation environment, office, etc.) and AWS resources.

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