August updates trigger 0xc0000409 errors on Windows Server 2016

Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.

Replacement or Cloud? | 3 Field-Tested Options to Survive the Windows Server 2016 EOS

Hello. This is Matsumoto from ZERO INITS.We have entered the second half of 2026, and a certain 'decisive countdown' in the ...
BetaNews

Microsoft to phase out Windows Deployment Services in Windows Server

Microsoft will deprecate Windows Deployment Services in the next Windows Server release, per a Sept. 21, 2026 notice covering Windows Server 2016 through 2025.
Redmond

Microsoft Makes Azure Arc-Enabled Extended Security Updates for Windows Server 2016 Generally Available

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 ...
BleepingComputer

Microsoft fixes Windows Server auth issues caused by April updates

Microsoft has fixed a known issue causing authentication problems on Windows Server domain controllers after installing the April 2025 security updates. Platforms affected by these problems include ...