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2025-October-28 Service Incident
Incident
Report for Sauce Labs
Postmortem
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.
Resolved
After taking remedial action, Windows browser tests are now running normally, this incident is resolved.
Investigating
We are currently seeing elevated error rates for browser tests running on Windows 8 & 10 in the EU-Central-1, we are currently investigating.
This incident affected: Live Browser Testing (EU-Central) and Automated Browser Testing (EU-Central).