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Microsoft has released optional out-of-band (OOB) updates to fix a known issue triggering Kerberos sign-in failures and other authentication problems on enterprise Windows domain controllers after installing cumulative updates released during November's Patch Tuesday.
The problem was caused by cumulative updates made available during November Patch Tuesday
The Kerberos authentication protocol is having issues, and a fix is weeks away.
The torrent of problematic updates for Windows shows no signs of drying up. Since Patch Tuesday this month, Microsoft has already confirmed a Direct Access connectivity issue in various versions of Windows (which it sort of fixed by rolling back the update), now the company has issued a warning that this month's updates are also causing problems with Kerberos authentication.