Yep. Couldn't open the site either.
Also,
Your balance has been frozen until you make a deposit. Need to make a Deposit in the amount of 0.01 BTC. After payment of the deposit your account will be automatically activated."
This message is very familiar. Ponzi scheme sites always use statements like these when people who hasn't done a deposit is trying to withdraw.
Maybe tell us a bit on what cryptonbnb is to start with?