F5 has also entered the Internet firewall market, which is aimed at protecting data centers.

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"PDAs and smartphones represent a greater security threat to the enterprise than the hacking threats that created the Internet firewall industry, " he says.

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The company also claims that the only printers vulnerable are ones connected to the Internet without a firewall.

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While waiting for your ISP to deliver IPv6 connectivity, put together a plan for deploying IPv6 on your Internet-facing infrastructure, including your firewall, DNS servers and Web server.

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For instance, after the installation seemed done, I discovered I had lost the Wi-Fi Internet connection on both machines and had to temporarily turn off the firewall to restore it and then upgrade my antivirus software.

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"Overcautious customers tend to disable Poproxy manually in the Task Manager (accessed by hitting Control-Alt-Delete in Windows), others get weary of the program and decide to block it when their personal firewall reports that Poproxy is trying to connect to the Internet, " said Van der Grift.

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You may find that you are using a less popular computer brand which has yet to attract the attention of criminals, and your firewall may keep out some intruders, but all computers, if connected to the internet, are vulnerable.

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