Security and PrivacySadly, malware, spyware, hackers and privacy threats abound in today's world. Let's be paranoid and secure our penguins, and slam the doors on privacy exploits.
try googling (search) "snort" and read up on it--then install it if you already don't have it--then read some more. or use ethereal.
first turn off the ping replies from your computer--that's how they probably found you at first--then they follow up with the cracking/hacking attempts.
close all un-needed ports as you find them.
above all--install a firewall and allow only port 80 if you have a web server--incoming port allow, that is. SSH is other ports--FTP is other ports you need if you have those servers running--any port you don't have specific use for--close to incoming traffic.
Usually most default settings for the Linux firewalls will close those ports and you actually have to allow them to be used--i.e. open them if you need them.
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