On July 16, 2025, Microsoft announced the general availability of Hotpatching for Azure Arc–connected servers running Windows Server 2025. This release introduces a subscription-based model for non-Azure machines, enabling organizations to apply updates with minimal disruption.
This marks the first time Hotpatching is offered for non-Azure machines in a generally available form. The feature is delivered through a new subscription, allowing organizations to maintain security and uptime without relying on traditional patching methods that require reboots.
What is Hotpatching?
Hotpatching is a Windows Server update mechanism that allows patches to be applied without rebooting the system. It was previously available only for Azure virtual machines. With this release, Microsoft extends Hotpatching to on-premises and multi-cloud environments via Azure Arc.
This approach helps reduce downtime and improves operational efficiency by keeping systems patched and secure while avoiding service interruptions.
Key Features
Hotpatching for Azure Arc–connected servers includes:
- Rebootless Patching: Most updates are applied without restarting the server.
- Improved Uptime: Minimizes disruption to services during patching.
- Consistent Management: Enables unified patching across hybrid environments using Azure Arc.
- Security Maintenance: Keeps systems secure with regular updates.
This release supports Windows Server 2025 only. Earlier versions are not included in this general availability.
Licensing
Microsoft introduces a new subscription model for Hotpatching on Azure Arc–connected servers. This model applies to non-Azure machines and is required to use the feature.
For organizations evaluating licensing options or planning deployment, it is recommended to seek expert advice from SCHNEIDER IT MANAGEMENT to ensure compliance and optimal configuration.
FAQ
Which Windows Server version is supported?
Only Windows Server 2025 is supported in this release.
Is Azure Arc required?
Yes. The server must be connected to Azure Arc to use Hotpatching.
Is this available for Azure VMs?
Yes. Hotpatching remains available for Azure virtual machines, and is now extended to non-Azure servers via Azure Arc.
Is a reboot ever required?
Yes, in specific cases such as baseline updates. However, most patches do not require a reboot.
More Information
For full details, refer to the official Microsoft announcement: https://techcommunity.microsoft.com/blog/windowsservernewsandbestpractices/hotpatching-for-azure-arc%E2%80%93connected-servers-general-availability-and-subscriptio/4433915
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