In a recent turn of events, Microsoft has confirmed that its latest mandatory security update for Windows 11, identified as KB5066835, has led to significant disruptions. Users are reporting that the update has rendered localhost connections inoperable, preventing locally hosted applications from connecting to the network. This situation has prompted Microsoft to acknowledge the issue and announce plans for an emergency fix.
Update Complications and User Warnings
According to Windows Latest, the update has not only caused localhost connectivity problems but has also resulted in multiple installation failures and malfunctions with various peripherals. Users attempting to troubleshoot these issues online have been cautioned against seeking internet solutions, as these have proven ineffective. Instead, Microsoft advises affected users to await the emergency patch, which is expected to roll out within 48 hours.
In a detailed analysis, Windows Latest pointed out a regression in the kernel-mode HTTP server (HTTP.sys). This regression affects how browsers and applications connect to services hosted on the local address 127.0.0.1, leading to mishandled HTTP/2 handshakes and connection resets. The implications are far-reaching, particularly for those utilizing Internet Information Services (IIS), as the update has disrupted its functionality.
Peripheral and Recovery Environment Issues
In addition to the localhost issues, users have reported failures with certain Logitech peripherals, as well as problems with mouse and keyboard functionality in the Windows Recovery Environment (WinRE). This has rendered navigation within WinRE impossible, complicating efforts to troubleshoot or reset the operating system.
While some users have found temporary workarounds, these solutions come with significant risks. Engaging with system files without proper guidance can lead to further instability or prevent Windows from booting altogether. For those still operating on Windows 10, it’s advisable to ensure that the final security updates are installed, as these will be the last unless users opt into the Extended Security Updates (ESU) program.
As the situation unfolds, the fragility of Microsoft’s ecosystem is becoming increasingly apparent. The recent update issues highlight the challenges the company faces in maintaining stability across its platforms, particularly as it pushes for widespread adoption of Windows 11. With millions of users affected, the urgency for a reliable resolution is paramount.
