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There are commercial tools available from ISS, Network Associates and also a freeware one, Nessus, available from www.nessus.org. You should also look at the usual security Web sites, SecurityFocus.com, etc. for other options, too. Note that all scanners can only test for things they know about. They are like virus scanners in this respect; none of these tools protect you from new problems, and an old version of the tool may be worse than useless if you think you're safe and you aren't.
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