August updates trigger 0xc0000409 errors on Windows Server 2016

September 8, 2026 · 11:57 am 2 sources

Image: BleepingComputer

Coverage

Coverage

• Microsoft: Windows Server 2025 changes causing app crashes
  BleepingComputer · September 8, 2026 11:57
  Microsoft warned customers last week that they may experience application crashes on some Windows Server 2025 due to recent memory management changes. [...]
• August updates trigger 0xc0000409 errors on Windows Server 2016
  BleepingComputer · September 8, 2026 15:22
  Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled. [...]