Skip to content Sign up Sign in Explore Features Enterprise Blog Denial of Service Attacks /.pagehead Featured All Posts New Features Engineering Enterprise Meetups New Hires Watercooler Subscribe March 14, 2014 imbriaco Engineering On Tuesday, March 11th, GitHub was largely unreachable for roughly 2 hours as the result of an evolving distributed denial of service (DDoS) attack. I know that you rely on GitHub to be available all the time, and I'm sorry we let you down. I'd like to explain what happened, how we responded to it, and what we're doing to reduce the impact of future attacks like this. Over the last year, we have seen a large number and variety of denial of service attacks against various parts of the GitHub infrastructure. There are two broad types of attack that we think about when we're building our mitigation stra...