Cannot Install PowerShell Module - Unable to find module repositories

Description:

You try to Install a new PowerShell Module. But you got an error saying "No match was found for the specified search criteria and module name ' ' Try Get-PSRepository to see all available registered module repositories". However when you try to run Get-PSRepository command you got "Unable to find module repositories error".

You have try the following, but still have the problem:

• Make sure to Run as Administrator, 
• Make sure to use TLS 1.2 

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

• Unregister and Register
• Unregister-PSRepository -Name PSGallery
• Register-PSRepository -Default

Resolution:

Make sure there's no blocking at the Internet (proxy). Switch using different Internet connection and try to install again.

Using Microsoft Graph to Find Inactive Guest Users in Azure Active Directory

Description:

You have been using Azure Active Directory for a while. Now you notice you have several "external - guest" user listed in your Azure AD users. You need to gather the list of inactive guest user account.

Resolution:

We can try to get the list of inactive users by using Microsoft Graph.

Connect-MgGraph -Scopes "User.Read.All","AuditLog.Read.All"

 #Logon using Global Admin

$guestUsers = Get-MgUser -Filter "userType eq 'Guest' and accountEnabled eq true" -Property DisplayName, UserPrincipalName, SignInActivity, CreatedDateTime

$inactiveGuestUsers = $guestUsers | Where-Object {($_.SignInActivity.LastSignInDateTime -lt (Get-Date).AddDays(-90)) -or ($_.SignInActivity.LastSignInDateTime -eq $null)}

# Display the list of inactive guest users

$inactiveGuestUsers | Select-Object DisplayName, UserPrincipalName, @{Name="LastSignInDateTime"; Expression={$_.SignInActivity.LastSignInDateTime}}, CreatedDateTime

PowerShell Command to Identify Local Admin Account

Description:

You have several local account on your computer. One day, you need to find out which one is the real local Admin Account.

Resolution:

You can run the following PowerShell command on the local computer:

Get-CimInstance -ClassName Win32_UserAccount -Filter "LocalAccount = TRUE and SID like 'S-1-5-%-500'"

Error when using PowerShell Connect-MgGraph not recognized

Description:

You already install the Microsoft Graph PowerShell SDK on your machine. However when trying to run a script that has "Connect-MgGraph" command, you encountered not recognized cmdlet, function, script  error. You have also restarted the machine and make sure the Microsoft Graph Module was loaded.

Resolution:

There might be some conflict between Microsoft Graph module and other module on your machine. The possible conflict are with Azure AD or MSOnline modules.

Try to install the Microsoft Graph PowerShell SDK on other machine which has minimum or has only the default PowerShell module.

Group Managed Service Accounts (gMSA) - PowerShell Command

Following are several useful group Managed Service Accounts (gMSA) PowerShell command.

• To query the Active Directory for list of host where a specific gMSA account could be use, please run the following:

• Get-ADServiceAccount [-Identity] ITFarm1 -Properties PrincipalsAllowedToRetrieveManagedPassword

• To add member hosts to where the gMSA account could be use, please run the following:

• Set-ADServiceAccount [-Identity] ITFarm1 -PrincipalsAllowedToRetrieveManagedPassword Host1$,Host3$

• To install gMSA account to a host, please run the following command on the host machine:

• Install-ADServiceAccount -Identity ITFarm1

• To create a new gMSA account, please run the following

• New-ADServiceAccount ITFarm1 -DNSHostName ITFarm1.contoso.com -PrincipalsAllowedToRetrieveManagedPassword ITFarmHosts$

Azure AD Connect - AD DS Connector Account

If we want to know the specifics of the service account for the Active Directory connector(s). 

Use the following two lines of Windows PowerShell:

Import-Module "C:\Program Files\Microsoft Azure Active Directory Connect\AdSyncConfig\AdSyncConfig.psm1"

Get-ADSyncADConnectorAccount

PowerShell Script to Find Last Logon Date Information from Computer with Windows 7 Operating System

Description:

You need to get a list of all Windows 7 computer with Last Logon Date information in your domain.

Resolution:

Run the following PowerShell command:

Get-ADComputer -Filter * -Properties OperatingSystem, LastLogonDate | where {$_.OperatingSystem -match "Windows 7 Professional"} | select Name, OperatingSystem, LastLogonDate | sort LastLogonDate –unique | Export-Csv c:\workcomputers.csv

PowerShell command - GetWmiObject

> To get the remote computer name from IP Address:
Get-WmiObject Win32_ComputerSystem -ComputerName remotecomputerIPaddress | Select Name
> To get the computer description from a machine remotely:
Get-WmiObject Win32_OperatingSystem -ComputerName remotecomputernameorIPaddress | Select Description
> To get the currently logged on user from a machine remotely:
Get-WmiObject Win32_ComputerSystem -ComputerName remotecomputernameorIPaddress | Select UserName

Windows PowerShell Syntax

> To list all the PowerShell commands available for group policy module:

Get-Command -module GroupPolicy

or

Get-Command *-GP*
 

> To list all the PowerShell commands available for active directory module:

Get-Command -module activedirectory

or

Get-Command *-AD*

 

> For more detail information about certain PowerShell commands:
 

Get-Help (commandname) -detailed

Get-Help (commandname) - examples

Get-Help (commandname) -full

or

Get-help (commandname) -online