Block Repeat Attempts to Login

Does anyone know of a smart way to block repeat attempts at login to Mac OS X server. I've perused my logs for a simple test server I configured out of my house and I've already got a ton of attempts to login via "admin" user.
Would love to have a script or enable a feature that blocks the IP after 15 attempts.
Also would love to know if there is a comparible setup for my linux servers.
Thanks in advance.
  Mac OS X (10.4.8)  

use ssh keys, sshd_config, and a firewall to block connection attempts.
or there's http://denyhosts.sourceforge.net.
configuring a firewall to do the work for you will give you better flexibility than using denyhosts.

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