How do you know when a hacker is hacking your computer??

I just want to know what are the signs that a hacker is inside your computer while on the net??
And how to stop this from happerning??
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juggernautAsked:
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moonlightConnect With a Mentor Commented:
Since this question is in the web authoring area, I guess you mean hackers coming in from your web facility.

a) signs: private files are altered by the WWW user.
b) the most easy way: do not give any access rights for writing to your www user account.

But if you must:
Do not have shell programs in your cgi-bin directory. Do not allow anyone to read your scripts. Try to break in to your own system in order to notice security holes. Check up on the files every now and then..  Use user authentication for files you want to protect. make sure your configuration files are hidden and not readable..
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BluemoonCommented:
a) if stange things happen on your computer, Unusual processen are running, Someone else than yourselfs ROOT is, unusual long handdisk activity, You'll get mail from other computers where you haven't been saying they got hacked by you

b) unplug from the net ?
No, just kidding, You'd have to have some security around your ports, first thing you need to do is activate some logging, and limit the access from outside your computer to you

WHAT OPERATING SYSTEM ARE YOU USING ?????
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