Starting around 03:22 UTC on February 5, 2025, the end-user traffic that traversed through one of the data centers in Frankfurt experienced availability issues. Akamai's investigation revealed that the issue was caused by human error during a planned maintenance activity to upgrade network routers to the latest firmware version in the affected data center. The maintenance was scheduled for a specific set of routers, where only a subset was supposed to be taken out of service for the code upgrade. However, the engineer inadvertently took the entire set of routers out of service, leading to a service interruption for the customer’s traffic. The existing internal alerts were triggered as expected, and the appropriate actions were taken. The change was rolled back to mitigate the impact. The issue was mitigated at around 03:52 UTC on February 5, 2025. We have identified process and tooling gaps that could have helped prevent this issue. We are actively working on preventive measures to ensure such incidents are avoided in the future. We will take appropriate preventive actions once the root cause & contributing factors are determined. We apologize for the impact. 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.