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This is the comment you were replying to, attached to the article Automatically Blocking SSH Attackes From Script Kiddies?:

#1 Re: Automatically Blocking SSH Attackes From Script Kiddies? Posted by gna (212.40.xx.xx) on Thu 22 Sep 2005 at 14:50 I mentioned in my weblog a package named KnockD. The idea is: You open access only for trusted IPs and disallow any other. Allow only those IPs who knocked in the right order on the right ports, for opening the connection, and close the door again, but the alive connetion will not be terminated. You need a good configured firewall, and the clients (linux/win exists) need to knock before attempting to connect. I will post a sample config on firewall and knockd.conf soon if needed in my weblog here.

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