GitHub February 28th DDoS Incident Report

On Wednesday, February 28, 2018 GitHub.com was unavailable from 17:21 to 17:26 UTC and intermittently unavailable from 17:26 to 17:30 UTC due to a distributed denial-of-service (DDoS) attack. We understand how much you rely on GitHub and we know the availability of our service is of critical importance to our users. To note, at no point was the confidentiality or integrity of your data at risk.

We are sorry for the impact of this incident and would like to describe the event, the efforts we’ve taken to drive availability, and how we aim to improve response and mitigation moving forward.

Source: githubengineering.com