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Last time, I stressed having a NAT router–or router/firewall–between your PC and the Internet as a first line of defense. This is without question the first, most important security step, but it can be useless unless you have it properly configured; in fact, omitting one crucial first step can leave you even more vulnerable to attack that you would be without the device.
So, put this on your list as Security Maxim #3: Always change the default username and password of any configurable device you put on your home network.
Next time: You’ve changed your default router password; you still may be vulnerable.