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chas_m

 
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Member Since: Jan 22, 2010
Location: Victoria, BC
Posts: 17,608
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Mac Specs: Mid-2012 MBP (16GB, 1TB HD), BenQ second monitor, iPhone 5s 32GB, iPad Air 2 64GB

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Actually, turn the software firewall OFF. You already have a superior hardware firewall in place -- it's called your router. Your software firewall won't stop any port scans or DDOS attacks, because that's already been stopped at your router. Don't take my word for it, check your logs. Compare the ones from your software firewall to your hardware one.

You should however, as chscaq suggests, encrypt your wireless network if you're using one. WPA2 is recommended, and you can also limit the machines that can access it by MAC address (if you're unlikely to have or want guest users accessing it), and turn off the broadcasting of the SSID name (the wireless network's name).

For those in apartment complexes especially, these steps are useful.

Apart from that, it's more common sense: don't pirate software, don't fall for scareware, avoid porn and gambling sites (or use a proxy if you must), don't OK the install of anything you don't recall downloading.
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