Help for my server please!

Hi i have a private server of metin2
is under attack !
The hacker blocks my connection with putty and leaves the server off
I think that this using ddos or injection sql
That I can do?
Please i need help for my little server :(

Install a IPFW or PF Firewall and contact the hoster this are the right way =D

Sorry for my bad english ...

The Hacker blocks the putty port then contact the hoster he can help you 8)