Microsoft’s August cumulative update for Windows Server 2019, KB5063877 (released August 12, 2025), finally closes out a high‑visibility clustering regression introduced by the July rollout: a Cluster Service failure that caused repeated service restarts, node quarantines and virtual machine...
Microsoft has released an update that resolves a severe clustering regression in Windows Server 2019 introduced by July’s cumulative security rollup, closing a weeks‑long incident that left some failover clusters unstable and virtual machines repeatedly restarting. Background / Overview
In early...
bitlocker
cluster service
cluster shared volumes
csv
enterprise it
eventid7031
failover cluster
it support
kb5062557
kb5063877
patch management
patch rollout
s2d
servicing stack update
ssu
windows server 2019
windows update
wsus
The July 2025 security update for Windows Server 2019, identified as KB5062557, has introduced significant challenges for IT administrators managing failover clusters. Post-installation, numerous organizations have reported critical issues, including cluster service failures and repeated virtual...
availability
cluster quarantine
cluster service failures
cluster troubleshooting
eventid7031
extended security updates
failover cluster
it administration
kb5062557
microsoft support
server management
server security
server updates
sysadmin challenges
virtual machine stability
virtualization
windows 2025
windows security
windows server 2019
windows update