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For network scanning, I've found nessus to be quite good. SATAN is another alternative. If you are looking for something to check for local miss-configurations/holes checkout COPS and TIGER
Distribution: OpenBSD 4.6, OS X 10.6.2, CentOS 4 & 5
Posts: 3,660
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Nessus is good, and fairly comprehensive. It's important to note that Nessus run with "safe checks" (which is the default, I believe) will have a lot of false positives, especially on Red Hat because RH back-ports patches w/o bumping version numbers. If you turn off "safe checks" then several of the tests can actually crash the remote machine. You've been warned!
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