Microsoft Confirms Windows Server Active Directory Sync Bug Affecting Large Organizations

Windows Server Active Directory Synchronization Issue Confirmed

Microsoft has acknowledged a significant software bug affecting Active Directory synchronization in Windows Server 2025 installations, according to reports from the company’s official health dashboard. The issue, which emerged following September’s Patch Tuesday updates, causes directory synchronization failures when security groups contain more than 10,000 members.

Technical Details and Impact Scope

Sources indicate the synchronization problem affects customers using Active Directory directory synchronization (DirSync) for on-prem installations of Active Directory Domain Services. The bug was reportedly introduced in KB5065426 and subsequent updates, with Microsoft now tracking the issue on its Windows Release Health dashboard.

Analysts suggest the impact primarily affects larger organizations, as smaller businesses typically maintain security groups below the 10,000-member threshold. However, the report states that the potential disruption could be widespread given that enterprise-level customers often manage substantial Active Directory groups.

Microsoft’s Temporary Workaround Solution

While Microsoft hasn’t provided a permanent resolution timeline, the company has recommended a temporary registry modification as a workaround. According to the technical guidance, affected customers should navigate to Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Policies\Microsoft\FeatureManagement\Overrides and create a REG_DWORD value named “2362988687” with data set to 0.

Microsoft emphasizes that registry modifications carry risks, advising administrators to consult Windows Registry guidance for advanced users before implementing changes. The company reportedly plans to release a more reliable patch in a future Windows update, though specific timing remains undetermined.

Enterprise Implications and Industry Context

The synchronization failures could lead to various downstream issues for affected organizations, sources indicate. Active Directory synchronization problems typically impact user authentication, access controls, and directory-dependent services across enterprise networks.

This incident occurs amid other significant technology developments, including Apple’s M5 iPad Pro launch and M5 chip advancements. Meanwhile, other industry news includes PPE firm repayment issues, unconventional business strategies, and H-1B visa fee changes affecting tech hiring landscapes.

Recommended Course of Action

IT administrators in enterprise environments should immediately check their Active Directory group sizes and monitor synchronization status, according to industry best practices. Organizations experiencing synchronization failures are advised to carefully implement Microsoft’s workaround while awaiting a permanent patch. The situation highlights the ongoing challenges in maintaining system stability following routine security updates, with analysts suggesting thorough testing before deploying future Patch Tuesday releases in production environments.

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