Outage in Cisco Umbrella

[Cisco Secure Connect/ Cisco Umbrella]- Sandboxing Service Issue – Denver Region

Resolved Minor

March 20, 2026 - Started 25 days ago - Lasted about 1 hour
Official incident page

Incident Report

Summary AI Generated

Cisco Umbrella's sandboxing file scanning service in the Denver region experienced an issue that caused a fail-open condition for customers using Umbrella and Secure Connect services with the optional sandbox feature enabled. The impact was limited to a small subset of customers connected through the Denver EDC. The issue was resolved after 56 minutes with services returning to normal operation.

We are currently investigating an issue affecting the sandboxing -file scanning service in the Denver region. Customers utilizing Umbrella and Secure Connect services via the Denver EDC, and who have enabled the optional sandbox feature, may encounter a fail-open condition under certain circumstances. The impact is currently expected to be limited to a small subset of customers. Engineers are actively working to identify the root cause, and we will provide updates as more information becomes available.

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Latest Updates ( sorted recent to last )

RESOLVED 25 days ago - at 03/20/2026 05:19PM

The issue has been resolved. Services are operating normally, and functionality has been restored.

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MONITORING 25 days ago - at 03/20/2026 05:14PM

The issue affecting the sandboxing - file scanning service in the Denver region has been mitigated.
Services are operating normally, and functionality has been restored. We are continuing to monitor the environment to ensure stability.

INVESTIGATING 25 days ago - at 03/20/2026 04:26PM

We are currently investigating an issue affecting the sandboxing -file scanning service in the Denver region.

Customers utilizing Umbrella and Secure Connect services via the Denver EDC, and who have enabled the optional sandbox feature, may encounter a fail-open condition under certain circumstances. The impact is currently expected to be limited to a small subset of customers.

Engineers are actively working to identify the root cause, and we will provide updates as more information becomes available.

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