• How to Convert Certificate Format Using OpenSSL

    How to Convert Certificate Format Using OpenSSL

    OpenSSL is an open-source library and a command-line tool that helps admins and developers perform various cryptographic tasks, such as generating key pairs, certificate signing requests (CSR), verifying certificates, encrypting and decrypting data, identifying certificate information, verifying file integrity and much more. In this post, you will learn how to convert TLS certificates into different…

  • How to Verify Digital File Signatures using SigCheck

    How to Verify Digital File Signatures using SigCheck

    SigCheck, part of the SysInternals suite, is a command-line utility offering security features such as verifying the digital file signature and calculating file hashes using multiple hashing algorithms. Distributing digitally signed files to customer computers is a common practice for trusted software publishing companies. The code-signing process uses a certificate from a reliable certification authority…

  • Step-by-step Guide: How to Add an ESXi Host to VMware vCenter Server (vCSA)

    Step-by-step Guide: How to Add an ESXi Host to VMware vCenter Server (vCSA)

    Let’s examine how to incorporate a standalone host with an ESXi hypervisor into the VMware vCenter Server (vCSA) for administrative centralization and utilization in cluster setups. Establish a connection to the vCenter Server by launching the vSphere Client URL in your internet browser (https://vcenter_server_fqdg_or_ip/ui). Choose the datacenter, folder, or cluster where you intend to introduce…

  • Comparing Sudo for Windows vs. Runas and Sudo for Linux

    Comparing Sudo for Windows vs. Runas and Sudo for Linux

    Sudo for Windows has been available since Build 26052 and is currently only accessible through the Windows Insiders program as part of preview builds for Windows 11. At this time, it appears that sudo will not come to Windows Server 2025. In this article, I explain how to use sudo in Windows 11 and compare…

  • Step-by-Step Guide to Installing WireGuard VPN on OPNsense Firewall

    Step-by-Step Guide to Installing WireGuard VPN on OPNsense Firewall

    If you are employing an OPNsense firewall, the option to configure WireGuard as a VPN server instead of OpenVPN is a viable option. WireGuard’s clients are available for all major operating systems, proving very fast and lightweight. This can easily be installed as an OPNsense extension and configured via the web console. For implementing a…

  • How to Craft Your Own Custom Windows Image with Pre-Installed Applications

    How to Craft Your Own Custom Windows Image with Pre-Installed Applications

    In this guide, we’ll cover how to create a custom Windows 10/11 installation image with pre-installed apps, necessary files, and other environment and application settings. Currently, many admins prefer to deploy a clean Windows image and then install all the required programs and tools on the computer: deploy software via GPO, using the installation commands…

  • How to Resolve Sysprep Errors: When Sysprep Fails

    How to Resolve Sysprep Errors: When Sysprep Fails

    In this post, you will learn what to do when Sysprep fails and how to fix the error: Sysprep was not able to validate your Windows installation. Sysprep is a built-in Windows tool used to generalize OS images before deploying them to multiple machines. There are several reasons why Sysprep fails, but the error message…

  • How to Enable Windows Auto-Login Without a Password

    How to Enable Windows Auto-Login Without a Password

    Usually, you want to secure your Windows account with a strong password or other authentication methods. However, there may be situations where you want to set up a Windows computer to log in automatically without requiring a password. If only one user operates a PC and the computer is physically protected from unauthorized access, you…

  • An Easy Guide to Ansible Roles: A Practical Example

    An Easy Guide to Ansible Roles: A Practical Example

    If you want to deploy a web server like Apache or Nginx with Ansible, you can create a playbook outlining the installation and configuration steps. This approach works well for a single web server but can become repetitive and time-consuming if you need to deploy many servers. To streamline the process, you can use Ansible…

  • A Comprehensive Guide to Installing the New Teams Client: Bulk Installer, Policy Adjustments, Classic Client Differences and System Prerequisites

    A Comprehensive Guide to Installing the New Teams Client: Bulk Installer, Policy Adjustments, Classic Client Differences and System Prerequisites

    Users will gradually receive the new Teams client depending on the license and update channel. Microsoft now offers a bulk installer for businesses looking to migrate to the new version. Subsequently, admins can enforce a specific client for users using a policy. The new Teams client is a Progressive Web App running on Edge WebView2.…