Resolved after 1 hour 29 minutes, affecting EU-Central and EU-Central, on October 28, 2025.
### **Dates:** Tuesday, October 28th 2025, 11:40 UTC - 14:05 UTC. ### **What happened:** Windows based tests in the EU data center were failing on startup which led to a decrease in availability of Windows-based Virtual Machines. ### **Why it happened:** A product defect was introduced which caused an issue with starting Windows-based VMs. ### **How we fixed it:** The deployment was rolled back to a stable version. ### **What we are doing to prevent it from happening again:** We have improved monitoring & alerting and enhanced our post-deployment validation.
Affected components
Update timeline
- investigating Oct 28, 2025, 12:53 PM UTC
We are currently seeing elevated error rates for browser tests running on Windows 8 & 10 in the EU-Central-1, we are currently investigating.
- resolved Oct 28, 2025, 02:22 PM UTC
After taking remedial action, Windows browser tests are now running normally, this incident is resolved.
- postmortem Nov 06, 2025, 04:00 PM UTC
### **Dates:** Tuesday, October 28th 2025, 11:40 UTC - 14:05 UTC. ### **What happened:** Windows based tests in the EU data center were failing on startup which led to a decrease in availability of Windows-based Virtual Machines. ### **Why it happened:** A product defect was introduced which caused an issue with starting Windows-based VMs. ### **How we fixed it:** The deployment was rolled back to a stable version. ### **What we are doing to prevent it from happening again:** We have improved monitoring & alerting and enhanced our post-deployment validation.
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