I had described a possibly working workaround in the blog post and the hope that Microsoft will give milk and provide a fix in the following months. Nach Deinstallation des Updates funktioniert alles wieder. Der Defender lässt sich dann nicht mehr öffnen und stürzt mit dem Fehlercode 0x800705b4 ab. Im Blog-Beitrag Windows 8.1/Server 2012 R2: KB5003681 blockt Defender Echtzeitschutz (Error 0x800705b4) habe ich berichtet, dass das Juni 2021-Sicherheitsupdates KB5003681 (Security Only Quality) dem Echtzeitschutz des Windows Defender unter Windows 8.1 und Windows Server 2012 R2 blockieren kann. Defender real-time protection blocked (Error 0x800705b4) With the December 2021 security updates, Microsoft then fixed the issue of Microsoft Defender not starting in Windows Server Core (e.g., through cumulative update KB5008218) (see my blog post Patchday: Windows 10 Updates (December 14, 2021)). Microsoft had to admit, it after installation of certain updates on Windows Server 2019 or even Windows Server 2022 the Microsoft Defender for Endpoint as virus protection makes problems and possibly no longer starts. I had addressed it in the blog post Windows Server 2019/2022: Microsoft Defender for Endpoint fails after Nov. Fix for Windows Server 2019/2022 Defender issue
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