Microsoft confirms recent Windows updates cause problems establishing Netlogon secure channel connections
Microsoft has issued a warning to users of various versions of Windows Server that a recent update is causing problems with Netlogon connections.
Affecting Windows Server 2022, 2019, 2012 R2, 2012, 2008 R2 SP1 and 2008 SP2, the problem means that some applications and appliances on domain controllers may be unable to establish a Netlogon secure channel. Microsoft is blaming not only the KB5009555 update, but "updates released January 11, 2022" for the problem.