19 Common SSH Commands in Linux With Examples


Secure Shell is an important protocol for anyone managing and controlling remote machines. This guide covers the most useful commands such as specifying a username for your connection, using a different port number, generating SSH key pairs, and…

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How to Generate & Set Up SSH Keys on CentOS 7


Learn how to set up SSH key authentication on CentOS to safely communicate with remote servers. Create the key pair, copy the public key, connect to the remote server, and disable password authentication.

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How to Enable/Disable UFW Firewall on Ubuntu 18.04


Ubuntu comes pre-installed with a firewall configuration tool, UFW (Uncomplicated Firewall). This tutorial shows you how to disable and enable an Ubuntu UFW firewall using the command line.

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How to Install Sophos Intercept X Advanced for Server


If you are using the Sophos Central Admin platform to manage and secure your devices, you will want to activate Server Protection. Deploy Sophos agents on Linux and Windows servers, with the help of this installation guide.

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How to Enable SSH on Debian 9 or 10


If you are using Debian 9 or Debian 10 to manage servers, you must ensure that the transfer of data is as safe as possible. This tutorial covers the necessary steps you need to take to establish a secure connection with a remote machine by using…

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How to Generate SSH Keys on Ubuntu 18.04


Establishing a connection with a remote server without taking the proper security measures can lead to severe consequences. This article is meant to help system administrators configure SSH Keys on Ubuntu 18.04. The instructions allow you to set up…

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How to Install Squid Proxy Server on CentOS 7


Squid Proxy specifically allows a server to cache frequently visited web pages. When a user seeks a web page or file, the request goes to the proxy server — the intermediary device between the desktop computer and the internet. The proxy server…

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How to Install Kali Linux on VirtualBox


Kali Linux is a Debian-derived Linux distribution designed for penetration testing. With over 600 preinstalled penetration-testing programs, it earned a reputation as one of the best-operating systems used for security testing. As a security-testing…

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How to Change Administrator Password on Windows Server 2008 R2 or 2012


There may come a time when you need to change the admin password on your Windows Server. How to change your administrator password largely depends on whether you remember the old password or not. If you are routinely changing a known administrator…

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How to Check the OpenSSL Version Number


OpenSSL is an open-source cryptographic library and SSL toolkit. The applications contained in the library help create a secure communication environment for computer networks. This article explains how to determine the OpenSSL version by entering a…

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