Introduction
Microsoft has identified a significant complication affecting Windows Server 2025 systems. Following the application of the April 2026 cumulative update, labeled KB5082063, several servers are experiencing continuous reboot cycles. This development has become a pressing concern for IT administrators overseeing enterprise environments.
The update, rolled out on April 14, 2026, encompasses both the latest security patches and enhancements from the previous optional preview release. However, it has also introduced a critical issue with domain controllers restarting repeatedly.
Details of the Reboot Loop Problem
In an updated release note from April 16, 2026, Microsoft highlighted the reboot loop affecting domain controllers, creating challenges for enterprise IT teams. Additionally, some systems encounter installation failures, displaying error code 0x800F0983 during the update process.
Microsoft has confirmed they are actively examining diagnostic data related to these installation issues. They noted that only a limited number of servers face this specific error, yet it remains a concern for impacted organizations.
Community Feedback and IT Workarounds
Reports from system administrators on online forums, such as Reddit’s Patch Tuesday megathread, support Microsoft’s findings. Administrators have shared instances where domain controllers became trapped in reboot loops post-update.
An effective temporary fix involves booting into Directory Services Restore Mode (DSRM) and uninstalling the problematic update, allowing the servers to function normally again. The issue particularly affects non-Global Catalog domain controllers in complex Active Directory setups.
Additional Concerns with BitLocker
Microsoft has also warned about potential BitLocker recovery mode issues. Servers with specific BitLocker Group Policy configurations might be forced into recovery mode after the update, impacting access for enterprise-managed systems.
This problem is less likely to affect individual users but poses a risk for organizations with certain security policies, necessitating manual recovery key input.
Conclusion
Despite these complications, the KB5082063 update does provide substantial security and reliability improvements across various Windows components. However, Microsoft has yet to offer a formal solution to the reboot loop or installation errors. Administrators are advised to pause the deployment of this update on domain controllers until a fix is available.
To mitigate risks, IT teams should keep updated with the Windows Server 2025 release health dashboard and ensure offline BitLocker recovery keys are accessible. The accompanying servicing stack update, KB5082062, aims to enhance update infrastructure stability.
