Windows Update Disrupts Web Server Operations
Microsoft has confirmed that recent Windows 11 updates are causing significant disruptions to IIS web services, according to reports from the company’s Release Health Dashboard. The problematic updates, identified as KB5066835 and KB5065789 released around September 29, have been generating “ERR_CONNECTION_RESET” errors when accessing localhost loopbacks and other IIS-based connections.
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Technical Root Cause Identified
The report states that the issue originates from conflicts within the Windows HTTP stack driver (HTTP.sys), which handles web traffic for server applications. Sources indicate that “server-side applications relying on HTTP.sys may experience issues with incoming connections,” resulting in failed IIS websites or completely blank pages when accessed. The problem appears to affect development environments and internal testing setups most severely.
Analysts suggest the inconsistent manifestation of the bug across different systems relates to varying conditions including internet connectivity differences, system timing variations, and update installation sequences. This means some Microsoft Windows environments may function normally while others experience complete service disruption.
Immediate Workaround Available
While Microsoft develops a permanent solution, the company has provided IT administrators with a known issue rollback (KIR) accessible through specialized Group Policy configurations. According to reports, this temporary fix restores system stability by reversing the problematic changes without requiring complete uninstallation of the updates.
The Redmond-based Microsoft has made the Group Policy package available for download to administrators managing Windows 11 24H2, 25H2, and Windows Server 2025 systems. Sources indicate the policy becomes accessible under Computer Configuration > Administrative Templates following installation.
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Broader Update Context
This development comes amid other significant industry developments in the technology sector. Microsoft has simultaneously removed an upgrade block on Windows 11 24H2 devices after resolving separate third-party driver conflicts that had been preventing installations.
The timing coincides with what analysts describe as a complex Patch Tuesday cycle that has seen multiple challenges emerge across different Microsoft products and services. Technology professionals are reportedly monitoring these market trends closely as they navigate update management strategies.
Impact on Development Communities
The disruption to Internet Information Services has particularly affected developer workflows and internal application testing environments. According to industry observers, the intermittent nature of the problem makes it challenging to identify and resolve quickly across distributed development teams.
These technical challenges emerge alongside other related innovations in the web services space, highlighting the ongoing balancing act between system security, functionality, and stability in modern computing environments. System administrators are advised to implement the temporary workaround while awaiting Microsoft’s permanent resolution.
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