WSUS Archives

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September 17, 2026

What Windows 11 KB5129195 fixes

On September 14, 2026, Microsoft released KB5129195, an out-of-band cumulative update for Windows 11 versions 24H2 and 25H2, transitioning systems to build 26100.9457 for 24H2 and 26200.9457 for 25H2. The update addresses several regressions, including failed connections and sign-ins in Remote Desktop Services, host-folder sharing failures in Plan9 file sharing for HCS-managed Linux virtual machines, and failures affecting 8-channel and 3D-audio modes in USB Audio Class 1.0. However, it does not fix ongoing issues with AMD Radeon graphics cards, such as freezes, black screens, and driver timeouts, which have affected various hardware configurations. KB5129195 is available through multiple distribution channels, including Windows Update and WSUS.

Winsage

August 28, 2026

Microsoft Issues Windows 11 Version 26H2 to Release Preview

Microsoft has released Windows 11 version 26H2 (Build 26300.9278) in the Release Preview Channel for customers to preview ahead of its general availability later this year. This version will be delivered as an enablement package, allowing for seamless integration of new features and enhancements. Users with PCs in the Release Preview channel can manually install this version. Key features for business users include Windows Backup, app actions from the Taskbar, and improvements to File Explorer. Organizations can deploy Windows 11 version 26H2 using Windows Update client policies and Windows Server Update Services (WSUS). Updates to the ISOs on the Windows Insider Program download site will also reflect this new version.

Winsage

August 10, 2026

Azure Arc-Enabled ESUs for Windows Server 2016 Now Available

Microsoft is offering Extended Security Updates (ESUs) for Windows Server 2016, which will provide critical security patches until January 2030, after the end of extended support on January 12, 2027. Organizations can enroll their Windows Server 2016 instances via Azure Arc to receive these updates without migrating to Azure. The ESUs are available through a pay-as-you-go pricing model, allowing flexibility for on-premises servers and other cloud platforms. By using Azure Arc, organizations gain access to Azure management tools for improved visibility and compliance. IT administrators should connect eligible systems to Azure Arc to manage ESU enrollment and compliance effectively. ESUs are intended as a temporary solution while businesses modernize applications and plan migrations to supported platforms.

Winsage

August 10, 2026

Which Windows 11 Update Is Causing Problems in 2026? – TheZeroNet

KB5094126, released in June 2026, is causing significant issues for Windows 11 users, including BSODs, boot failures, BitLocker lockouts, and problems launching Office applications. This update has particularly affected HP enterprise hardware, leading to BitLocker recovery loops and black screens. The issues stem from disk space limitations related to Secure Boot certificate handling and restricted EFI partition space. Affected users are advised to locate their BitLocker recovery keys and consider workarounds, such as launching Office applications directly. Windows 10 users are also experiencing similar problems due to the related update KB5094127. Microsoft is expected to release fixes in subsequent updates, including KB5101650 in July 2026.

Winsage

July 24, 2026

Microsoft shares some details on Azure outage that blocked Windows 11 update downloads

This week, Meta experienced a global outage affecting Facebook users, followed by Microsoft facing performance issues with its M365 services, including Teams and SharePoint. Microsoft also reported difficulties with Azure, impacting Windows 11 updates and the Microsoft Store. The issues began around 11:15 AM PST on July 23, 2026, with a notification to users about the Azure outage affecting Windows Update and related services. Microsoft initiated recovery efforts and by 1:45 PM PST, announced that the issues were resolved and services were restored. Currently, there are no ongoing issues reported on the Microsoft Service Health Status page, but the incident is documented on the Windows Release Health page.

Winsage

July 21, 2026

Microsoft Confirms WSUS Sync Issue Causing Update Delays and Timeouts

Microsoft has identified synchronization delays and timeout errors affecting Windows Server Update Services (WSUS), which risks the timely delivery of Windows updates. WSUS is a management tool for distributing Windows updates across networks. Microsoft deprecated WSUS in September 2024 but continues to provide security fixes and updates. The synchronization issue has led to failures and delays in downloading update metadata, particularly impacting Windows 11 version 23H2 and later, Windows 10 version 1607, and Windows Server 2012 and later. This issue began around July 13, 2026, with mitigation efforts starting on July 18, 2026. Microsoft has released a partial fix for newly installed or rebuilt WSUS servers, while existing servers may still face challenges. The company is developing additional fixes and guidance. In previous years, Microsoft dealt with other WSUS-related issues affecting enterprise clients.

Winsage

July 21, 2026

Microsoft Releases New Windows 11 Security Update Fix For Dell Users

On July 21, Microsoft announced an emergency security update, KB5121767, for Windows 11 versions 25H2 and 24H2, due to complications from the July Patch Tuesday update, KB5101650, which caused performance issues for certain Dell users, including unexpected system shutdowns. The problem was linked to a conflict between the Windows USB-C Connection Manager interface and the Intel Innovation Platform Framework Processor Participant driver. Affected Dell models include the Dell Pro Max 14 Premium MA14250, Dell Pro Max 16 Premium MA16250, Dell XPS 17 9720, and Dell XPS 17 9730. Microsoft recommends that only users of these impacted devices install the update, while assuring unaffected users that no action is necessary. Additionally, Microsoft acknowledged issues affecting Windows Server Update Services that hinder Windows Update scans, stemming from a buildup of publishing metadata, and has implemented a service-side mitigation to address this.

Winsage

July 20, 2026

Windows Server Update Services buckle under Microsoft’s metadata mountain

Microsoft's Windows Server Update Services (WSUS) is facing significant challenges, particularly with existing deployments experiencing synchronization issues described as "sync purgatory." The problems stem from "severe degradation" due to a "buildup of publishing metadata," leading to slow synchronization processes and timeouts. This issue is not related to the recent Patch Tuesday update but has seen a "heightened impact" since July 13, 2026. Although WSUS is a critical tool for managing updates in enterprise environments and remains supported, Microsoft has recommended transitioning to alternative solutions, especially cloud-based options, since October 2024. Many administrators continue to rely on WSUS, which poses risks of failed synchronization and potential vulnerabilities. As of now, Microsoft has not provided a workaround for affected servers but has implemented a mitigation for new installations as of July 18. Existing servers are still experiencing difficulties, and Microsoft is working on solutions to help remove problematic metadata. The issue affects nearly all desktop and server operating systems supported by WSUS, including Windows 11 26H1 and older versions like Windows 10 1607 and Windows Server 2012. Administrators currently have limited options and must monitor the situation as it develops.

Winsage

July 20, 2026

Microsoft confirms Windows Server Update Services sync delays

Microsoft is addressing an issue impacting Windows Server Update Services (WSUS) servers, causing synchronization challenges for over a week. WSUS, used to manage updates for Microsoft products across enterprise networks, typically syncs daily with Microsoft Update servers. The ongoing issue has disrupted this process, affecting both client platforms (Windows 10 version 1607 and later) and server platforms (Windows Server 2012 and later). Microsoft acknowledged reports of increased synchronization times and sync operation timeouts, with the situation escalating on July 13, 2026. Mitigation measures were implemented to alleviate synchronization issues for newly installed or rebuilt WSUS servers, and Microsoft is working on solutions for previously affected servers. Synchronization times have been restored for new installations, but efforts continue to assist customers in removing affected metadata from older servers. This is not the first WSUS-related challenge for Microsoft; similar issues occurred in May 2025 and July 2025, with resolutions provided shortly after.

Winsage

July 19, 2026

Microsoft confirms WSUS service degradation impacting all versions of Windows

A significant issue has emerged with the Windows Server Update Service (WSUS), affecting all versions of Windows client and server. Microsoft acknowledged the service degradation that began before July 14, coinciding with the latest Patch Tuesday. This degradation has caused prolonged synchronization times and occasional timeouts during sync operations on WSUS servers, attributed to a buildup of publishing metadata. Microsoft is working on a resolution to improve performance and restore synchronization times. The affected platforms include various versions of Windows 11, Windows 10, and Windows Server from 2012 to 2025. An update is expected to be released shortly to address the issue.