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Windows Server 2025 AD DS sync remediation

Advisory/Mitigation
First reported
Last updated
Happening score
H score 27
1 unique sources, 2 articles

Summary

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Microsoft issued a Known Issue Rollback Group Policy and registry workaround for a Windows Server 2025 directory-sync bug that can disrupt Microsoft Entra Connect Sync. The temporary mitigation matters because the flaw can leave large AD security groups only partially synchronized after KB5065426 or later updates. Administrators can apply the rollback policy on managed devices or the registry key on non-managed systems until the permanent fix reaches all customers.

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Timeline

  1. 20.10.2025 18:27 1 articles · 8mo ago

    Microsoft acknowledges Windows Server 2025 AD DS sync bug

    Initial Disclosure

    Microsoft acknowledged a known issue affecting Windows Server 2025 systems that can leave Active Directory Domain Services (AD DS) synchronization and Microsoft Entra Connect Sync incomplete when large AD security groups exceed 10,000 members after the September 2025 Windows security update (KB5065426) or later updates.

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  2. 20.10.2025 18:27 3 articles · 8mo ago

    Microsoft releases KIR workaround for Windows Server 2025 AD DS sync bug

    Mitigation Patch Update

    Microsoft made a Known Issue Rollback Group Policy available for impacted Windows devices and documented a registry override so administrators can reduce Microsoft Entra Connect Sync disruptions on Windows Server 2025 systems until the permanent fix reaches all customers next month's Patch Tuesday.

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