GitHub Fighting DDoS

[silicon_toad2000]

Code repository GitHub has been taking steps to protect its systems and
the data they hold from an ongoing distributed denial-of-service (DDoS)
attack. GitHub became aware of connectivity problems late Tuesday
evening (August 25).
http://www.zdnet.com/article/github-combats-ddos-cyberattack/
http://arstechnica.com/security/2015/08/github-attacked-again-as-chinese-developers-forced-to-pull-code-by-police/
http://www.theregister.co.uk/2015/08/26/github_wobbles_under_ddos_attack/