For Linux, what is the best program/daemon out there that would detect, block, and report computers scanning the server's ports, sequentially or randomly, for SSH, MySQL, popular web-based administering systems, and other security-sensible services that were moved from their default ports?
closed as off topic by MadHatter, MDMarra, Brent Pabst, Dave M, mdpc Nov 14 '12 at 17:07
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ConfigServer Services is a set perl modules/Scripts/daemons, which effectively provide you with port scanning ability, detect it, report and and block it with number of ways to tweak its options.
I personally recommend it for small scale servers.