Introduction

Azure Pass-through Authentication (PTA) is a new authentication method introduced in Azure AD Connect in the 2.1.15.0 or latest version.

Benefits of Pass-through Authentication (PTA)

  • Synchronizes objects from On-prem AD to AAD
  • Password writeback
  • Seamless-Sign-On (SSO)
  • Hybrid Identity Solutions

Prerequisites

Please consider the configuration below if you are using a firewall or any proxy in your On-prem to Azure AD environment.

Make sure that authentication is the agent that can make an outbound request to Azure AD over the following ports.

  • 80
  • 443
  • 8080

Step 1

I have downloaded the latest Azure AD Connect from Microsoft's official website, and below I have included the download link also.

Step 2

Just tick I agree and click Continue.

Step 3

Go to the Customize Option here.

Step 4

Just leave all the tick options empty and click Install.

Step 5

Here, select Pass-through authentication and enable Single-Sign-On. Click Next.

Step 6

Here you should enter your M365 Global Administrator Credentials. I have mentioned my credentials below in the screenshot.

Step 7

Click Add Directory, then get the AD forest account Wizard and enter any user of your On-prem AD. In my case, I have created an adsyncuser in my OU group.

Step 8

Once you have verified your local domain directory, you can click Next.

Step 9

Now, please do what is in the following screenshot.

Step 10

This is my On-prem AD user. Now I'm going to sync my O365 OU user to Azure AD.

Step 12

In optional features, just tick Password writeback only.

Step 11

I have selected my O365 OU.

Step 13

Enter your On-prem Administrator Credentials.

Step 14

Review your configuration and Install it.

Step 15

My on-prem AD user successfully synchronized to the Azure AD account.

Seamless Sign-On Group Policy Steps

Step 1

Open the Group Policy Management Editor tool.

Step 2

Edit the group policy that is applied to some or all of your users. This example uses Default Domain Policy.

Step 3

Navigate to User Configuration > Policies > Administrative Templates > Windows Components > Internet Explorer > Internet Control Panel > Security Page. Then select Site to Zone Assignment List.

Step 4

Enable the policy and add the below mentioned URL and Data Value.

Value name: https://autologon.microsoftazuread-sso.com

Value (Data): 1

Step 5

Navigate to User Configuration > Policies > Administrative Templates > Windows Components > Internet Explorer > Internet Control Panel > Security Page > Intranet Zone. Then select Allow updates to status bar via script.

Step 6

Enable the policy setting, and then select OK.

Group policy preference config setup

Step 1

Open the Group Policy Management Editor tool.

Step 2

Edit the group policy that is applied to some or all ofyour users. This example uses Default Domain Policy.

Step 3

Navigate to User configuration > Preferences> Windows Settings > Registry > New> Registry item.

Step 4

Make sure the mentioned values have been entered correctly.

  • KeyPath: Software\Microsoft\Windows\CurrentVersion\InternetSettings\ZoneMap\Domains\microsoftazuread-sso.com\autologon
  • Value name: https
  • Value type: REG_DWORD
  • Value data: 00000001

Step 5

This is my domain logged-in computer.

Now, successfully working on my SSO configuration, I have given only my email address here.

Step 6

I have signed in successfully without any password.

Conclusion

This article taught us how to setup Pass-through authentication PTA and Seamless-Sign-On SSO in Azure AD Connect. And if you have any questions please contact me.

Thanks.