hacking attempt on my server (need to close ssh)

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http://forums.fedoraforum.org – Hi all, I've just had a log email sent from the server box and it seems Somebody's trying to gain access to the server via ssh sshd: Authentication Failures: root (210.38.xxx.xx): 16 Time(s) unknown (210.38.xxx.xx): 7 Time(s) Invalid Users: Unknown Account: 7 Time(s) & it seems that it's somebody who's at Zhanjiang Ocean University in china I've got the firewall enabled, but how do u set up rules to stealth the server's IP address to make it invisible & disable ssh so only I can log into the server to fix any problems (eithernet cable) not over the net And also it seems that sendmail has been run 46 times Sendmail was started 46 time(s) Messages To Recipients: 2 Addressed Recipients: 2 Bytes Transferred: 60334 Messages No Valid Rcpts: 0 so how can I block everything Cheers (HowTos)