Meta description: Learn how to set up and use hotpatching in Windows Server 2025 to apply updates without rebooting, ensuring maximum uptime and better security.
Introduction
With the release of Windows Server 2025, Microsoft has introduced hotpatching — a powerful feature that lets administrators apply security updates without restarting the server. This capability significantly reduces downtime, making it especially valuable for mission-critical systems where uptime is a top priority.
In this guide, we’ll explain what hotpatching is, how it works, and the steps to get started with Windows Server 2025 hotpatching.
What Is Hotpatching?
Hotpatching is a zero-reboot update method that applies security patches directly to the server’s memory without requiring a restart.
Key benefits include:
- Zero downtime for updates – No service interruptions during patching.
- Improved security – Apply patches immediately after release.
- Better user experience – No disruptions for end users or applications.
Requirements for Hotpatching in Windows Server 2025
Before enabling hotpatching, ensure that:
- You are running Windows Server 2025 Datacenter: Azure Edition or a compatible SKU.
- Your server is connected to Windows Update or Windows Update for Business.
- You have administrative privileges to configure update settings.
How Hotpatching Works
- Baseline installation – The server starts with a full update that requires a reboot.
- Regular hotpatches – Security patches are applied in-memory without restarts.
- Periodic cumulative updates – Every few months, a reboot is still required to maintain system integrity.
Getting Started with Hotpatching
Follow these steps to enable hotpatching:
- Open Windows Admin Center or Server Manager.
- Navigate to Settings > Windows Update > Advanced Options.
- Enable Hotpatching in the update settings.
- Configure automatic updates for real-time patch deployment.
- Monitor updates using Event Viewer or Windows Update history.
Best Practices for Hotpatching
- Test patches in a staging environment before applying to production servers.
- Combine with security monitoring tools to ensure patch effectiveness.
- Schedule periodic full reboots to maintain kernel stability.
Conclusion
Hotpatching in Windows Server 2025 is a game-changer for IT admins aiming to balance security and uptime. By enabling and managing hotpatching effectively, organizations can keep their servers protected without impacting business operations.
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