Exchange: convert a shared mailbox into a user mailbox

In this tutorial, I will show you how to convert a shared mailbox to a user mailbox on Exchange using PowerShell. It happens that for the needs of consulting a shared mailbox on mobile, users request a change of mailbox type. Mobile applications do not allow you to view shared mailboxes unless you go through …

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GLPI 10: link with an Active Directory

Presentation In this tutorial, I will explain how to link GLPI 10 with an Active Directory to allow users to log in with their domain account. This link will allow you to synchronize users in GLPI, if you use an email collector, this allows you to provision user accounts and allows the import of emails …

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Nginx: resolve error: could not build optimal proxy_headers_hash

In this article, I will explain how to fix the could not build optimal proxy_headers_hash error on Nginx when doing a configuration test with nginx -t. This warning is displayed when publishing several dozen virtualhosts on Nginx in reverse proxy. To solve this problem, you need to increase the value of the following parameters: Open …

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Create a sub-certificate authority with AD CS

In this tutorial, I will explain how to create a sub CA with Windows AD CS. Sub-CAs are underused on firewalls when SSL decryption is implemented, generating a sub-CA with Windows AD CS allows you to avoid deploying the firewall certificate if you have already deployed the root certificate. Before you begin, verify that the …

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Windows 11 24H2: GPO application problem – gpupdate

With the deployment of Windows 11 24H2, you may have group policy application issues, which is visible by running the gpupdate command. Error message: Computer policy could not be updated successfully. The following errors were encountered:Group Policy processing failed. Windows could not resolve the computer name. This could be due to one of the following …

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Active Directory: Change Object Owner in Bulk

Below you will find scripts that will allow you to mass change the owner of different Active Directory objects such as: In a “normal” situation, the owner of Active Directory objects is: When an object is created by a user who is not a member of one of the above groups through delegation or use …

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Configure a reverse proxy with Apache on Ubuntu

Introducing the Reverse Proxy In this tutorial, I will explain how to configure a reverse proxy with Apache on Ubuntu (By adapting the Apache installation commands, this tutorial can easily be transposed to other distributions). Before getting into the technical part, let’s take a look at what a Reverse proxy is? A reverse proxy is …

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Install WSUS role on Windows Server 2025

In this tutorial, we will see how to install the WSUS (Windows Server Update Services) role on Windows Server 2025, which will allow you to have a server in your environment to control the distribution of updates for Microsoft products (Windows, Office, SQL Server, etc.). The WSUS role is also a “component” of MECM, because …

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Windows Server 2025: Enable SSH Server for Remote Access

In this tutorial, I will explain how to SSH server on Windows Server 2025 to administer it remotely. If you have been following me for several years, this is not the first article I have done on OpenSSH on Windows Server. At the beginning of the portability of the SSH server on Windows Server, to …

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Windows Server 2025: Joining the Computer’s Active Directory Domain

In this tutorial, we will see how to join a computer running Windows Server 2025 to an Active Directory domain. Before joining the Active Directory domain, you must have a user (administrator) account in the target domain with the necessary rights to add a computer. Before you make sure that the domain join is successful, …

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