Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
Windows Report on MSN
Windows Server 2016 August update can trigger CompatTelRunner crashes
Microsoft confirms the August 2026 update can trigger CompatTelRunner.exe crashes and 0xc0000409 errors on Windows Server ...
Microsoft makes Azure Arc-enabled Extended Security Updates generally available for Windows Server 2016 legacy workloads. Azure Arc ESUs provide critical security updates after Windows Server 2016 ...
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