On August 15, 2025, from 19:02-19:07 UTC and from 19:20-20:04 UTC, the end-user’s traffic traversing the Madrid Datacenter (FABRIC-MAD2) experienced intermittent connection timeouts and availability issues (5xx errors). The traffic loss occurred due to one of the border routers blackholing traffic as a result of a defect in the legacy firmware. This defect was triggered when multiple interfaces on the router flapped simultaneously, causing the router to incorrectly forward traffic into a blackhole.

At 20:04 UTC on August 15, 2025, Akamai took the affected border router out of production , at which point the impact was fully mitigated. 

Akamai upgraded the router to a newer firmware version where this defect is fixed. In addition, we validated that no other routers in the Compute network are running the same legacy code to prevent a recurrence.

This summary provides an overview of our current understanding of the incident given the information available. Our investigation is ongoing and any information herein is subject to change.