Cisco Umbrella incident
Tunnel-based Connectivity Degraded in few Data Centers.
Cisco Umbrella experienced a minor incident on December 10, 2025 affecting Cloud Delivered Firewall and Cloud Delivered Firewall and 1 more component, lasting 4h 20m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Dec 10, 2025, 11:19 AM UTC
We are investigating an issue affecting tunnel connectivity for few Data Centers listed below: Singapore Atlanta Tokyo Paris Denver Ashburn New York Dallas Mexico City Chicago Madrid London Stockholm Customers may experience dropped or blackholed traffic, or see tunnels appear as down in dashboards. Our team is working to restore full connectivity as quickly as possible.
- investigating Dec 10, 2025, 11:32 AM UTC
We are continuing to investigate this issue.
- investigating Dec 10, 2025, 01:10 PM UTC
We are investigating an issue affecting tunnel connectivity.We will provide further updates as more information becomes available.
- identified Dec 10, 2025, 02:33 PM UTC
We have identified that a small number of servers have been impacted by the ongoing tunnel connectivity issue, while the majority of servers continue to operate normally. Our engineering team has initiated the mitigation process to fully resolve the issue. We will provide another update once the mitigation process is complete. Thank you for your continued patience as we work to restore full service.
- resolved Dec 10, 2025, 03:39 PM UTC
An issue was identified and resolved by our engineering team as of 15:30 UTC today. All services are now operating normally. We apologize for any inconvenience caused and thank you for your patience.