how to track a security problem

Hi, I think I'm being hit with a problem. For the last 3 days, around the same time I am getting big spikes in network usage on my server. I think someone's in there besides me.

How do I track this? I've checked my logs but haven't found anything. I might not be looking for the right stuff. Help!

linux/plesk 2.0

 

 

 

 

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