Installing this month’s Windows Server security update has knocked some enterprise domain controllers into continuous reboot cycles, Microsoft confirmed in a release health dashboard entry.
The company says the April 2026 patch, KB5082063, triggers crashes in the Local Security Authority Subsystem Service (LSASS) on non-Global Catalog domain controllers used in Privileged Access Management (PAM) deployments, leaving Active Directory authentication and directory services unavailable on affected servers.

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