Strengthening Smart Card Security for Remote Logins in Windows 11 Beta

Introduction

Microsoft introduced an important update to the Windows 11 Insider Beta version in order to raise security standards in remote working scenarios of businesses. This update makes the use of smart cards more secure in cloud-based remote desktop services such as Azure Virtual Desktop and Windows 365. Designed specifically for organizations using Microsoft Entra ID (formerly Azure AD) authentication, this feature plays a critical role in meeting compliance requirements.

Problem Description

In remote work environments, smart cards are widely used for user authentication. However, in traditional scenarios, it was not possible to automatically terminate the session in case of removal of a smart card. This could lead to security vulnerabilities by increasing the risks of unauthorized access. Particularly for organizations using Microsoft Entra ID authentication, this was contrary to the Zero Trust model and could violate compliance standards (for example, NIST, ISO 27001).

Solution: New Windows 11 Beta Features

The smart card redirection improvements that come with the Windows 11 Insider Beta version offer the following advantages:

Automatic session termination: If a smart card is removed, Azure Virtual Desktop and Windows 365 sessions are automatically terminated. This prevents unauthorized access.
Microsoft Entra ID compatibility: Particularly organizations using Entra ID authentication can implement strict security policies with this feature.
Support for compliance standards: Organizations can more easily comply with standards such as NIST SP 800-63, ISO 27001, and PCI DSS.

Technical Details

This feature is available in Windows 11 Insider Beta Build 26100.1011 and above. It works on the following components:

Azure Virtual Desktop (AVD): Smart card forwarding is supported in virtual desktop sessions.
Windows 365: Smart card security has been increased in cloud-based desktop services.
Microsoft Entra ID: Azure AD, used for authentication, can now terminate the session if a smart card is removed.

Application Steps

The steps below detail the procedure to follow to enable this feature in your organization. These steps require intermediate technical knowledge and must be performed on a device with Windows 11 Insider Beta.

Prerequisites

Windows 11 Insider Beta Release:

Start Menu → Settings → Windows Update → Windows Insider Program → Join

Join the Windows Insider Program and select Beta Channel. Install the latest Insider Beta.

Azure Virtual Desktop or Windows 365 Service:

If your organization does not use these services, first create the necessary services through Azure Portal

Smart Card and Routing Support:

Make sure that the smart card used is supported by Windows 11. Generally, PIV, CAC, and Smart Card (ISO 7816) compatible cards are supported.

Enable Smart Card Forwarding

For Azure Virtual Desktop:

Sign in to Azure Portal:

https://portal.azure.com

Select the Virtual Desktop group:

Azure Portal → Azure Virtual Desktop → Host pools
Select the relevant host pool and go to the Properties tab.

Enable Smart Card Redirection:

Find RDP Properties → Smart Card Redirection.
Enable Smart Card Redirection.
Save changes.

For Windows 365:

Sign in to the Microsoft Endpoint Manager (Intune) portal:

https://endpoint.microsoft.com

Create or edit Cloud PC policy:

Devices → Windows → Policies → Create policy
Select Cloud PC as the Policy type.

Configure Smart Card Redirection settings:

Configuration settings → Smart Card
Enable Smart Card Redirection.
Automatically disconnect session when smart card is removed option.
⚠️ Warning: This setting ensures that the session is automatically terminated if users remove their smart card. Enabling this option may affect user experience. Notify users about this change.

Assign the Policy:

Assign the Policy to relevant user or device groups.

Configuring Security Policies for Microsoft Entra ID (Azure AD)

You must also configure Microsoft Entra ID Conditional Access policies so that the session is automatically terminated in case of removal of a smart card.

Sign in to Microsoft Entra Admin Center:

https://entra.microsoft.com

Create a Conditional Access policy:

Follow the path Protection → Conditional Access → Policies → New policy

Policy name: For example, "Smart Card Removal Session Termination".

Users and groups: Select the users or groups to which the policy will apply.

Cloud applications: Select Azure Virtual Desktop and Windows 365.

Conditions:

Device platforms: Include all platforms (Windows, macOS, Linux).
Client apps: Include web, mobile apps and desktop clients.

Access controls:

Grant: Enable the "Require compliant device" and "Require multi-factor authentication" options.
Session:
- Sign-in frequency: Set as needed (for example, 1 hour).
- Persistent browser session: Disable.

Enable Policy: Test the Policy in Report-only mode. After making sure there is no problem, set it to On

Verification and Testing

Follow the steps below to verify that the settings are working correctly:

Login and smart card verification:

Smart card removal test:

Verify that the session is automatically terminated by removing the smart card while logged in.
The session is expected to be terminated within 30 seconds. This period may vary depending on the configured policy.

Log review:

Examine session termination events by following Event Viewer → Applications and Services Logs → Microsoft → Windows → TerminalServices-LocalSessionManager
The reason for terminating the session must be recorded as "Smart card removed"

Common Problems and Solutions

⚠️ Problem 1: The session is not terminated if the smart card is removed.
Solution:

Make sure that the configured policy is assigned correctly.

Make sure the Microsoft Entra ID Conditional Access policy is enabled and has the correct conditions.

Make sure Smart Card Redirection is enabled in the AVD or Windows 365 host pool.

Make sure the Windows 11 Insider Beta version used is the latest.

⚠️ Problem 2: Users report that they cannot insert their smart cards.
Solution:

Ensure that the smart card reader is installed and working properly on the user's local device.

Make sure Windows 11 supports smart card drivers. If necessary, download the latest drivers from the manufacturer's website.

Make sure smart card forwarding is enabled in the AVD or Windows 365 session.

⚠️ Problem 3: Session termination time is too long.
Solution:

Reduce the Sign-in frequency in the Microsoft Entra ID Conditional Access policy (for example, 15 minutes).

Review the Session Timeout settings in the AVD or Windows 365 host pool and reduce as necessary

Best Practices

Observe the following best practices when enabling this feature:

User Training: Inform users that the session will be automatically terminated if a smart card is removed. This encourages users to store their smart cards securely.
Policy Testing: Test policies in Report-only mode and collect user feedback. Ensure that policies are thoroughly tested before being implemented in the production environment.
Daily Monitoring: Monitor session termination events regularly and make adjustments as necessary.
Backup Plan:Ensure users have alternative authentication methods (e.g., MFA) in case of smart card issuance.

Conclusion

This update to Windows 11 Insider Beta allows organizations toraise security standards in remote work environments. Particularly for businesses that use Microsoft Entra ID authentication and have strict compliance requirements, this feature facilitates compliance with the zero trust model. Automatic termination of the session in case of removal of a smart card prevents unauthorized access and increases data security.

Although this feature requires intermediate technical knowledge, it can be easily implemented by following step-by-step instructions and best practices. Before enabling this feature in your organization, be sure to notify all users and stakeholders.