Back in my day, I would probe by hand. Now you can get commercial software that does the job for you.
Kevin MitnickCompanies spend millions of dollars on firewalls and secure access devices, and it's money wasted because none of these measures address the weakest link in the security chain: the people who use, administer and operate computer systems
Kevin MitnickOracle, for example, has even hired people to dumpster dive for information about its competitor, Microsoft. It's not even illegal, because trash isn't covered by data secrecy laws.
Kevin Mitnick