Microsoft Confirms WSUS Sync Issue Causing Update Delays and Timeouts

Microsoft has confirmed a new issue affecting Windows Server Update Services (WSUS) that is slowing synchronization and causing timeout errors on some servers. This problem could delay the delivery of Windows updates, with Microsoft only partially resolving it for newly deployed WSUS servers.

Windows Server Update Services (WSUS) is a management tool that allows organizations to control how Windows updates are distributed across their networks. Administrators can download update information to a central server, review and approve updates, and then deploy them to selected devices.

Microsoft officially deprecated WSUS (Windows Server Update Services) in September 2024. The company is no longer investing in new features or enhancements for WSUS, but the product remains supported and continues to receive security fixes, reliability updates, and update content through the WSUS channel.

How does the WSUS issue impact Windows Update deployments?

According to Microsoft, this issue causes synchronization to fail or be unusually long, and affected organizations may be unable to download the latest update metadata. Consequently, administrators could face difficulties deploying current Windows updates through WSUS or Configuration Manager. This bug affects Windows 11 version 23H2 and later, Windows 10 version 1607, and Windows Server 2012 and later versions.

“Organizations might experience increased synchronization times or sync operation timeouts on WSUS servers. This issue began in recent days, with heightened impact observed starting July 13, 2026, and service-side mitigation on Saturday July 18, 2026. After this day, synchronization times and sync operations are expected to be restored to normal,” Microsoft explained on the Windows Release Health dashboard.

Microsoft releases partial fix for new WSUS deployments

Microsoft has already deployed a fix that helps newly installed or rebuilt WSUS servers operate normally. However, the company has warned that existing affected WSUS servers may still experience synchronization problems. Microsoft is currently working on additional fixes and guidance to help organizations remove the problematic metadata that appears to be contributing to the problem.

In recent years, Microsoft dealt with several WSUS-related issues affecting enterprise customers. In 2025, the company confirmed a synchronization problem that prevented update deployments, and another issue that blocked delivery of a security update through WSUS. Microsoft also fixed an update-related error affecting some Windows 11 deployments in enterprise environments.