Windows 11 Authentication Failures Linked to Security Update Conflict
Microsoft has identified the root cause of widespread Windows 11 authentication problems affecting users since late August. The company’s security enhancements are reportedly conflicting with systems containing duplicate security identifiers, causing login and network access failures across multiple Windows versions.
Widespread Authentication Issues Emerge
Microsoft has confirmed significant login and authentication problems affecting Windows 11 and Windows Server 2025 systems, according to reports from the company’s support documentation. Sources indicate the issues began affecting users around August 29th, with problems persisting across both Windows 11 24H2 and the newer Windows 11 25H2 versions.