Brute force attack make my server down

Brute force attack make my server down

Hey guys,
everyday my server get attacked ,
i instaled the csf firewall and i follow these steps to ban ips automaticly : http://www.directadmin.com/forum/sho…521#post209521
and csf ban about 21 IPs , but today my server was down due to a high load average because the brute force attack .
so please can you tell me how i can resolove this problem.
im sorry for my bad english
thank you
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