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Is it possible at all to have apache running, permit http, https and dns services in Guarddog, open some ports, and yet resist trojans, US militaries etc. from breaking into my PC and use weapons of little or mass distruction?
I run trojans check and see: port 80 - open - possible trojans : Executor, RingZero.
Well its my understanding that the reason that new versions of these packages are released is to deal with known vulnerabilities. Microsoft has patches but it seems that we just fix the old package and update to the new one.
As for viruses, well thats not really a big issue in Linux. The nature of the filesystem helps against making viruses for Linux. That said, I myself downloaded the free version of f-prot and run the occasional scan(okay once a day...I'm paranoid).
I could be wrong though. There may be an all powerfull application that can guard against these trojans but if there is I've never heard of it.
No the default settings are fine. A good thing to do is to put /var on a sererate partition. That way if you get any sort of Denial of Service attack it will just fill up that partition and not the entire disk. Also if you change apache to listen on port 8001 then people will have to speficy that in there browsers: