The Microsoft Entra Global Secure Access (GSA) client is commonly deployed using Microsoft Intune. To deploy the client as an Intune Win32 app, administrators package the installer and a PowerShell installation script into an .intunewin file. Microsoft provides a sample PowerShell script that creates a log, configures Windows to prefer IPv4 over IPv6, and launches the installer. However, the sample has several limitations that can make it unreliable in production environments. To address these shortcomings, I’ve refactored the code to make it more robust and better aligned with enterprise deployment best practices.

Script Improvements

Microsoft’s PowerShell script for installing the GSA client has several significant limitations. My refactored version includes the following improvements.

1. Preserved the existing DisabledComponents setting. Microsoft’s example overwrites the entire registry value, potentially removing previously configured settings. My version sets the 0x20 bit to prefer IPv4 while preserving any other flags already present.
2. Validates the installer’s Authenticode signature. My revised script verifies that the installer has a valid Authenticode signature and that the signing certificate identifies Microsoft Corporation as the publisher.
3. Preserves the pending reboot state. My script records when the registry setting was changed and compares that timestamp with the device’s last boot time. If the device has not restarted, subsequent runs continue to return exit code 3010, even if an earlier installation attempt failed.
4. Expanded exit-code handling. The script writes a timestamped PowerShell transcript to the Intune Management Extension log directory, allowing it to be included with collected Intune diagnostics. Logging failures do not prevent the installation from continuing.
5. Intune-integrated logging. I’ve updated the script’s logging to use the Intune Management Extensions logs folder, so logs are captured by Intune’s diagnostics collection. Each run of the script generates its own timestamped log file, making troubleshooting easier. Also, logging failures never block installation.
6. Best practice alignment. I’ve added comment-based help, culture-invariant timestamps, and a $PSScriptRoot guard with a clean error to handle script execution issues. In addition, the script is digitally signed to support environments that enforce signed-script execution policies.

GitHub

I’ve published my refactored GSA client installation script on GitHub. You can download the script here:

https://github.com/richardhicks/gsa/blob/main/Install-GSAClient.ps1

Note: The script expects the installer to be named GlobalSecureAccessInstaller.exe. However, downloaded installers typically include the version number in the filename, such as GlobalSecureAccessInstaller_<version>.exe. Before creating the .intunewin package, either rename the installer or update the $InstallerName variable in the script.

Contribute

Suggestions and contributions are welcome. If you have ideas for making the GSA client deployment more robust or reliable, please submit a pull request on GitHub.

Summary

Microsoft provides a PowerShell script to deploy the Entra GSA client via Intune, but it has several limitations. This refactored version preserves existing registry settings, validates the installer, improves reboot and exit-code handling, integrates logging with Intune diagnostics, and better aligns with enterprise deployment best practices.

Additional Information

Install-GSAClient.ps1 PowerShell Script on GitHub

Prepare Win32 App Content for Upload to Microsoft Intune

Install the Global Secure Access Client for Microsoft Windows