DDoS Our Infrastructure
Incident Report for CLA Online Judge
Resolved
We have noticed a series of unusual access traffic from an IP located in the US at 06:45 PM UTC+7. This attack had a relatively large amount of traffic and bypassed the cloudflare firewall system, causing both of our servers to become inaccessible. We have investigated and successfully prevented this attack. However, we cannot rule out the possibility of a recurring attack, so we will set up a challenge from cloudflare before accessing the website. Thank you for your cooperation and understanding from all participants.

From CLAOJ with love <3
Posted Aug 09, 2023 - 19:45 GMT+07:00
This incident affected: Website.