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Monitoring LDAPS connectivity/certificate with PowerShell

Some time ago, I wrote a blog post on checking for LDAP, LDAPS, LDAP GC, and LDAPS GC ports with PowerShell. It mostly works, but it requires a tad bit of effort, and it doesn't cover the full scope that I wanted. Recently (well over 3 years ago), Chris Dent shared some code that verifies the LDAP certificate, and I thought this would be good to update my cmdlets to support just that with a bit of my own magic on top.

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The only command you will ever need to understand and fix your Group Policies (GPO)

I've been working on cleaning up Group Policies for a couple of months. While it may seem trivial, things get complicated when you're tasked with managing 5000 GPOs created over 15 years by multiple teams without any best practices in mind. While working on GPOZaurr (my new PowerShell module), I've noticed that the more code I wrote to manage those GPOs, the more I knew passing this knowledge to admins who will be executing this on a weekly/monthly basis is going to be a challenge. That's why I've decided to follow a similar approach as my other Active Directory testing module called Testimo. I've created a single command that analyses Group Policies using different methods and shows views from different angles to deliver the full picture. On top of that, it provides a solution (or it tries to) so that it's fairly easy to fix - as long as you agree with what it proposes.

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Using Win32_UserAccount WMI filter in PowerShell/Group Policies and what to avoid

Some months ago, I created PowerShell Script to create local administrative users on workstations - Create a local user or administrator account in Windows using PowerShell. It's a bit overcomplicated, but the goal was it should work for Windows 7 and up, and that means supporting PowerShell 2.0. As part of that exercise, I've been using Win32_UserAccount WMI based query to find local users and manage them to an extent. While Get-LocalUser exists, it's not suitable for the PowerShell 2.0 scenario. I also use the same query in GPO for WMI filtering. You can say it's been a good friend of mine.

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Get-ADObject : The server has returned the following error: invalid enumeration context.

In the last weeks, I'm working on a PowerShell module that the main goal is to work on gathering and fixing GPOs. I've been testing my module a lot of times on my test environment, and it worked fine till the moment I run it on production, and it started to fail pretty quickly. The difference between my environment and production is 25 GPOs vs. 5000 GPOs. The error I was getting:

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Active Directory DFS Health Check with PowerShell

One of the critical parts of Active Directory is DFS. It allows you to share same NETLOGON/SYSVOL folders across all Domain Controllers in your Forest. Its health is vital to the functionality of your Active Directory. If it's broken, a lot of things may not work, and it's not that easy to tell the status of it. At first sight, everything may seem to work correctly, but if you take a closer look - not so much. It's great if you find it out by yourself, but not fun if suddenly GPO's don't apply to some users, computers, and you find out a year later.

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Renaming NETBIOS name of Active Directory Error

Recently I was testing renaming the NETBIOS name of an Active Directory domain. While this process is fairly easy, there are a few gotcha's, and before one would like to rename their domain or NETBIOS name, serious testing is required to be sure everything works after rename. In the end, if something goes wrong, the rollback will not be a walk in a park. It will hurt, and it will eat your time. So there was I going thru the usual steps.

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Removing user from local administrator group based on data stored in Active Directory

We need to deal with a group names through SID's rather than names because each group name is different in different languages. The second problem is to distinguish whether a user is a local or domain user. Finally, I need to connect to Active Directory to verify if the user I am about to remove has ExtensionAttribute10 (or any other field in AD) filled in or not.

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