ByDavey Winder,
Senior Contributor.
Hot on the heels of the NSA publishing a “high-risk of compromise” alert for Microsoft Exchange server users, and the CVE-2025-9491 Windows vulnerability being exploited by attackers with no patch available, comes more bad news. Microsoft has confirmed another Windows update issue, this time impacting Windows 11 and Windows Server users, that leads to the repeated prompting for authentication credentials, the failure of valid credentials, and remote desktop connections. Here’s what you need to know and do.
Microsoft is continually evolving the security protections available to users of the Windows operating systems, as evidenced in the recent announcement of new functionality to help keep admin users safe from malicious applications and actors threatening accounts. Sometimes, these updates can cause issues, even through they are ultimately there to enhance security rather than make your life miserable for no reason. Such would appear to be the case with the latest confirmation from Microsoft that “added security protections that enforce checks on Security IDs” put into place with Windows 11 and Server updates “released on and after August 29,” could be causing authentication failures for some users.
