August updates trigger 0xc0000409 errors on Windows Server 2016

Thread starter Sergiu Gatlan
Start date Sep 8, 2026

Sergiu Gatlan

Guest

Sep 8, 2026

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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