Windows corporate servers began waiting hours for updates or lose communication with Microsoft services. The company confirmed a large-scale failure in the work of Windows Server Update Services, which affected many versions of Windows 10, Windows 11 and Windows Server.
Administrators have faced a sharp increase in WSUS synchronization time and time-out errors. The problems began a few days before the official message, and the most serious interruptions Microsoft recorded on July 13. The company does not associate the failure with a specific Windows update.
The reason was the accumulated official information that Microsoft uses when publishing updates. The excess volume of metadata slowed down the processing of queries and disrupted the synchronization of WSUS servers with the company's infrastructure.
WSUS allows organizations to centrally upload and distribute Windows updates, security patches, and other Microsoft packages. The failure does not interfere with the operation of ordinary home computers directly, but is able to delay the installation of patches in companies, government agencies and other large networks.
Microsoft launched a server patch on July 18. New and newly reconfigured WSUS servers should already be synchronized normally. For systems that have managed to get problematic metadata, the company prepares separate instructions for safe cleaning. Until such management is published, some administrators can continue to face delays and time-outs.
The failure affected Windows 11 versions from 23H2 to 26H1, several Windows 10 releases, including LTSC, as well as Windows Server 2012, 2012 R2, 2016, 2019, 2022 and 2025. Microsoft assigned the problem the status “softened”, but finally closing the incident has not yet become.
Administrators have faced a sharp increase in WSUS synchronization time and time-out errors. The problems began a few days before the official message, and the most serious interruptions Microsoft recorded on July 13. The company does not associate the failure with a specific Windows update.
The reason was the accumulated official information that Microsoft uses when publishing updates. The excess volume of metadata slowed down the processing of queries and disrupted the synchronization of WSUS servers with the company's infrastructure.
WSUS allows organizations to centrally upload and distribute Windows updates, security patches, and other Microsoft packages. The failure does not interfere with the operation of ordinary home computers directly, but is able to delay the installation of patches in companies, government agencies and other large networks.
Microsoft launched a server patch on July 18. New and newly reconfigured WSUS servers should already be synchronized normally. For systems that have managed to get problematic metadata, the company prepares separate instructions for safe cleaning. Until such management is published, some administrators can continue to face delays and time-outs.
The failure affected Windows 11 versions from 23H2 to 26H1, several Windows 10 releases, including LTSC, as well as Windows Server 2012, 2012 R2, 2016, 2019, 2022 and 2025. Microsoft assigned the problem the status “softened”, but finally closing the incident has not yet become.
