GitHub has been under DDoS attack since almost 4 days
By its own reckoning, it seems to be the “largest DDoS attack in github.com’s history.” The attack has affected all of GitHub. Some Online reports have claimed that the traffic was coming from China as attackers were reportedly using China’s search engine Baidu for the purpose of “HTTP hijacking.” This was later denied by Baidu.
Reports: GitHub Blog, Wall Street Journal, NetworkWorld