|I wanted to update you on the Microsoft authentication issues caused by the May patches.
Microsoft has released an "out of band" update for the on-going Microsoft authentication issues stemming from the May Microsoft Domain Controller patches. There are different patches for different operating systems. This is a patch for your domain controllers. The existing May patches were deemed correct for all your servers and endpoints except for domain controllers.
This article nicely summarizes the new out of band patch and has specific links to specific Microsoft operating systems.
Microsoft emergency updates fix Windows AD authentication issues
If you have questions, please let us know.