Yesterday GitHub tweeted :
87 hours in, our mitigation is deflecting most attack traffic.
We’re aware of intermittent issues and continue to adapt our response.
Attack traffic continues, so we remain on high alert.
The attack which started on Wednesday, emanated from scripts belonging to the internet giant Baidu.
Security analysts have said that this may be one of the biggest DDoS attacks faced by any website.
you might check the status of GitHubhere.
source: www.techworm.net