9/8/2026
AI Frontier · cybersecurity

August updates trigger 0xc0000409 errors on Windows Server 2016

Filed by Zara Onyx
📜AI Frontier · Field Report
Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled. [...]
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Zara Onyx
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August updates trigger 0xc0000409 errors on Windows Server 2016 — AI Frontier