http://www.theregister.co.uk/2014/10/30 ... _unclosed/
As a related point, Antivirus Software is nearly useless. For Windows, OSX, Linux, iOS, Android users etc, education on how to safely use your Network, computer, Browser, email, Router etc is more important than Anti-virus software. Never use a 3G dongle direct on Windows, but use a WiFi point with 3G dongle so you have a separate Firewall. The built in Windows firewall is useless.