Microsoft has confirmed a new known issue affecting Windows Server 2016 systems that causes domain controller lookups to fail after installing the KB5087537 May 2026 security update. [...]
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source https://www.bleepingcomputer.com/news/microsoft/microsoft-domain-controller-lookup-may-fail-on-windows-server-2016/
source https://www.bleepingcomputer.com/news/microsoft/microsoft-domain-controller-lookup-may-fail-on-windows-server-2016/