Microsoft says users might experience authentication issues on Domain Controllers (DC) running Windows Server. after installing security updates released during the November Patch Tuesday.

Microsoft has confirmed customer reports of NTLM authentication failures and high load after installing last month's Windows Server security updates.

Microsoft has hardened authentication for its DCOM Server in response to a vulnerability. Check for the impact on your network now before the change becomes permanent.

This month's Patch Tuesday is here, packed with 137 vulnerability fixes, including 14 rated critical and one publicly disclosed zero-day affecting Microsoft SQL Server.