On November 26, Bitfinex, the world's leading cryptocurrency exchange, reported on Twitter that their website had undergone a DDoS attack and the provider is doing its best to solve this problem.
Bitfinex is under DDoS attack. The DDoS attack started during earlier maintenance and has been ongoing since.
— Bitfinex (@bitfinex) 26 ноября 2017 г.
It was reported that the DDoS attack started during earlier maintenance and has been ongoing since that moment. DDoS attacks disrupt normal operations by degrading website and application performance and availability, sometimes knocking them offline completely and the average hourly cost of downtime due to an infrastructure failure is $100,000 per hour.