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Author: IT Expert

Christian, Microsoft MVP, Veeam Vanguard & Legend (2021–2026), VMware vExpert, and Cisco Champion, shares expert guides, how-to tutorials, troubleshooting insights, and technical tips across Windows, Linux, Mac, databases, cloud, networking, hardware, and information security.

Fix Operating System Loader failed signature verification” on Dell Safe BIOS Systems via PXE [Part 3]

Posted on 08/05/202603/06/2026 IT Expert By IT Expert No Comments on Fix Operating System Loader failed signature verification” on Dell Safe BIOS Systems via PXE [Part 3]
Fix Operating System Loader failed signature verification” on Dell Safe BIOS Systems via PXE [Part  3]

This technical deep-dive stems from the guide Update WinPE Boot Images with Windows UEFI CA Certificates [Part 2]. In this guide, we shall discuss “Fix Operating System Loader failed signature verification” on Dell Safe BIOS Systems via PXE [Part 3]”. Since I observed a critical discrepancy during deployment. The devices that had not yet been…

Read More “Fix Operating System Loader failed signature verification” on Dell Safe BIOS Systems via PXE [Part 3]” »

Windows, Windows Server

How to protect Microsoft 365 beyond native limits with VDC [Part 1]

Posted on 29/04/202620/05/2026 IT Expert By IT Expert No Comments on How to protect Microsoft 365 beyond native limits with VDC [Part 1]
How to protect Microsoft 365 beyond native limits with VDC [Part 1]

In this article, we shall discuss how to protect Microsoft 365 beyond native limits with VDC [Part 1]. Microsoft 365 provides strong native security and compliance capabilities, but it does not deliver a complete backup solution. Key gaps remain around long-term data retention, granular recovery, protection against accidental or malicious deletion, and resilience against ransomware…

Read More “How to protect Microsoft 365 beyond native limits with VDC [Part 1]” »

Backup

Update WinPE Boot Images with Windows UEFI CA Certificates [Part 2]

Posted on 27/04/202603/06/2026 IT Expert By IT Expert No Comments on Update WinPE Boot Images with Windows UEFI CA Certificates [Part 2]
Update WinPE Boot Images with Windows UEFI CA Certificates [Part 2]

Secure Boot embeds into the Unified Extensible Firmware Interface (UEFI) and ensures that the system boots using only software trusted by the hardware vendor. As stated in this blogpost “Enable Secure Boot: Fix Secure Boot certificates expiration [Part 1]“. For 15 years, the Secure Boot certificates that are part of Windows systems will start expiring….

Read More “Update WinPE Boot Images with Windows UEFI CA Certificates [Part 2]” »

Windows Server

AGMP extended support ends April 2026: Find alternative solution

Posted on 14/04/202620/05/2026 IT Expert By IT Expert No Comments on AGMP extended support ends April 2026: Find alternative solution
AGMP extended support ends April 2026: Find alternative solution

In this guide, we shall discuss “AGMP extended support ends April 2026: Find alternative solution“. Microsoft BitLocker Administration and Monitoring (MBAM) and Advanced Group Policy Management (AGPM), both components of the Microsoft Desktop Optimization Pack (MDOP). Have reached their official End of Support today (14/04/2026). Please see How to extend a VM Hard Disk on VMware…

Read More “AGMP extended support ends April 2026: Find alternative solution” »

Windows Server

Steps to customize Windows PE boot images

Posted on 14/04/202603/06/2026 IT Expert By IT Expert No Comments on Steps to customize Windows PE boot images
Steps to customize Windows PE boot images

You can customize the Windows PE (WinPE) boot images included with the Windows ADK by adding drivers, optional components, and the latest cumulative updates, because they include only a minimal set of features and drivers by default. In this guide, we shall discuss “Steps to customize Windows PE boot images”. Please, see how to enable…

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Windows, Windows Server

[World Backup Day] V13 Upgrade Failure: Veeam Configuration Backup Saved the Day

Posted on 04/04/202629/05/2026 IT Expert By IT Expert No Comments on [World Backup Day] V13 Upgrade Failure: Veeam Configuration Backup Saved the Day
[World Backup Day] V13 Upgrade Failure: Veeam Configuration Backup Saved the Day

In-place upgrades represent the standard and vendor-recommended approach for advancing Veeam Backup & Replication (VBR) to newer releases, ensuring continuity of configuration, and retention of job etc without requiring a full reinstallation. But without a test lab, you are essentially performing a high-wire act. In this Real‑world “V13 Upgrade Failure: Veeam Configuration Backup Saved the…

Read More “[World Backup Day] V13 Upgrade Failure: Veeam Configuration Backup Saved the Day” »

Backup

Fix unable to contact Server: This may be the server does not exist

Posted on 01/04/202629/04/2026 IT Expert By IT Expert No Comments on Fix unable to contact Server: This may be the server does not exist
Fix unable to contact Server: This may be the server does not exist

In this blog post, you will learn how to fix “Fix unable to contact Server: This may be the server does not exist.” You may have run into this error after performing a swing migration, as described in this blog post “Build a New DC vs Swing Migration: Upgrade Server OS Correctly“. Plase, see AZURE…

Read More “Fix unable to contact Server: This may be the server does not exist” »

Windows Server

How to fix ADDS already contain a computer account

Posted on 01/04/202601/04/2026 IT Expert By IT Expert No Comments on How to fix ADDS already contain a computer account
How to fix ADDS already contain a computer account

In this blogpost, we will learn how to fix ADDS already contain a computer account. This issue can occur after a swing migration, such as the one outlined in “Build a New DC vs Swing Migration: Upgrade Server OS Correctly“. Replacing a Domain Controller (DC) hardware is one of those tasks that looks simple but…

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Windows Server

Reset or reinstall Windows Server without deleting the VM

Posted on 25/03/202601/04/2026 IT Expert By IT Expert No Comments on Reset or reinstall Windows Server without deleting the VM
Reset or reinstall Windows Server without deleting the VM

If you have created a VM on Hyper-V, Proxmox, VMware, or XCP-ng and want to reinstall Windows, you don’t need to delete the VM or recreate it. In this guide, we will show you how to reinstall Windows directly on an existing VM while keeping the VM configuration intact. Therefore, in this guide, we will…

Read More “Reset or reinstall Windows Server without deleting the VM” »

Windows Server

Build a New DC vs Swing Migration: Upgrade Server OS Correctly

Posted on 25/03/202608/04/2026 IT Expert By IT Expert No Comments on Build a New DC vs Swing Migration: Upgrade Server OS Correctly
Build a New DC vs Swing Migration: Upgrade Server OS Correctly

Because unsupported operating systems (OS’) introduce security risks and can affect compliance requirements, organizations should migrate to supported versions of Windows Server. In my lab environment, the domain controllers currently run Windows Server 2022 despite not affected. I want to take advantage of the newer capabilities available in Windows Server 2025. To accomplish this, we…

Read More “Build a New DC vs Swing Migration: Upgrade Server OS Correctly” »

Windows Server

How to replace Veeam Recovery Orchestrator License

Posted on 11/03/202626/03/2026 IT Expert By IT Expert No Comments on How to replace Veeam Recovery Orchestrator License
How to replace Veeam Recovery Orchestrator License

During the installation of Veeam Recovery Orchestrator (VRO), I initially applied an evaluation license, which expires after 30 days. Since this is not sustainable for my lab environment, I requested an NFR (Not‑For‑Resale) license, as discussed here “how to apply and install Veeam NFR License“. Therefore, in this article, I will discuss How to replace…

Read More “How to replace Veeam Recovery Orchestrator License” »

Backup

Fix failed to connect to the backup server: Make sure it is online

Posted on 11/03/202617/03/2026 IT Expert By IT Expert No Comments on Fix failed to connect to the backup server: Make sure it is online
Fix failed to connect to the backup server: Make sure it is online

Recently while I was discussing the steps on how to license Veeam Enterprise Manager and Add VBR Servers. I ran into the following error which prompted the created of this topic “Fix failed to connect to the backup server: Make sure it is online”. Please, see how to link an iPhone with Windows PC with…

Read More “Fix failed to connect to the backup server: Make sure it is online” »

Backup

How to fix Domain Join Error during Windows Deployment

Posted on 11/03/202625/03/2026 IT Expert By IT Expert No Comments on How to fix Domain Join Error during Windows Deployment
How to fix Domain Join Error during Windows Deployment

The message “ZtiDomainJoin has attempted to join to domain” comes from Microsoft Deployment Toolkit (MDT). This happens during an automated or Lite touch OS deployment as shown in the image below. Therefore, in this guide, we shall discuss How to fix Domain Join Error during Windows Deployment. Please see how to fix the following errors…

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Windows Server

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