Microsoft has released out-of-band optional updates to fix a known issue that causes Kerberos authentication problems on enterprise domain controllers after installing security updates earlier this month to address CVE-2020-17049. IT admins are recommended to install the optional updates on Domain Controllers only if they are affected by this known issue. The issue only affects Windows Servers and Windows 10 devices and applications in enterprise environments. The update is not available through Windows Update or Microsoft Update channels, but you can download it from the Microsoft Update Catalog or use Windows Server Update Services (WSUS)
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-fixes-windows-kerberos-authentication-issues-in-oob-update/