KB5063877: FIxed: the Cluster Service would repeatedly stop and restart.

August 12, 2025—KB5063877 (OS Build 17763.7678)

Summary
This security update includes fixes and improvements that are a part of the following update:
July 8, 2025—KB5062557 (OS Build 17763.7558)

The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting.

• [Cluster Service] Fixed: A known issue affecting Windows Server 2019 where the Cluster Service would repeatedly stop and restart. This behavior caused nodes to fail to rejoin the cluster or enter quarantine, virtual machines to restart multiple times, and frequent Event ID 7031 errors in the event logs. The issue was specific to configurations using BitLocker with Cluster Shared Volumes (CSV).
• [Input and Composition] Fixed: A known issue with the Microsoft Changjie Input Method. Users were unable to select words after a recent update.