Microsoft confirms the August 2026 update can trigger CompatTelRunner.exe crashes and 0xc0000409 errors on Windows Server ...
Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
Microsoft warned customers last week that they may experience application crashes on some Windows Server 2025 due to recent memory management changes.
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