Outage report · Major outage

Trello outage on Dec 27, 2025

Outbound Email, Mobile Push Notifications, and Support Ticket Delivery Impacting All Cloud Products

SeverityMajor outage

StartedDec 27, 2025, 04:42UTC

ResolvedDec 27, 2025, 05:20UTC

Duration38m

What happened

Trello reported a major outage starting Dec 27, 2025, 04:42 UTC, affecting Atlassian Support Ticketing. It was marked resolved at Dec 27, 2025, 05:20 UTC.

The incident lasted 38m from first report to resolution.
Trello had reported 2 other partial or major outages in the 90 days before it.
2 other vendors we track reported a significant incident within 12 hours of it.

Latest update from Trello

### Summary On **December 27, 2025**, between **02:48 UTC and 05:20 UTC**, some Atlassian cloud customers experienced failures in sending and receiving emails and mobile notifications. Core Jira and Confluence functionality remained available. The issue was triggered when **TLS certificates used by Atlassian’s monitoring infrastructure expired**, causing parts of our metrics pipeline to stop accepting traffic. Services responsible for email and mobile notifications had a critical path dependency on monitoring path leading to service disruptions. All impacted services were fully restored by **05:20 UTC**, around **2.5 hours** after customer impact began. ### IMPACT During the impact window, customers experienced: * **Outbound product email failures** \(notifications and other product emails did not send\). * **Identity and account flow failures** where emails were required \(e.g. sign‑ups, password resets, one‑time‑password / step‑up challenges\). * **Jira and Confluence mobile pu

Read Trello's official incident report ↗