It takes a little more knowledge than that. There are varying degrees, what I would assume you're looking at primarily is "script kiddie" status, in that you want to look at brute forcing your server, trying the well known exploits and so forth to make your server reasonable secure to all but the most dedicated crackers.
If, however, you wanted to make your server near-bullet proof, then it will take a lot more than run-of-the-mill applications I'm afraid.
I would hesitate to google the above keywords, but be VERY careful what you download. A lot of "hacking" utilities contain trojans themselves to don't download from anywhere that seems less than respectable. Also, ensure you have up to date anti virus and firewall programs before using any prebuilt programs such as port scanners or brute force mechanisms.
There are plenty of legitimate tools out there though, what do you think real system admins use? Go check out somewhere like downloads.com, there will be network utilities that can scan ports and so forth I'm sure, although brute force may be off the list.
Goodluck, just make sure you read plenty of technical articles and understand what you're doing and why. Otherwise you're no more than that aforementioned script kiddie.
John
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