[ycombobreaker]

The CBOE website is separate from the trading system. Futures in the US are regulated by the CFTC. There is no reason to believe that this is manipulation. As others have mentioned, it is likely that their website is simply getting hugged by the Internet due to the new contract.

[csomar]

I know that, but DDOSers target everything even if it doesn't stop operations.

I also think some bitcoin exchanges are using this model too. Bitfinex trading did not stop when their website went down the last time.