Port forwarding

If you do port forwarding, is the same as you drill a hole at your house.
Eventually you are also inviting unknown insect into your house without you
notice it. So after a while, your own house has been invaded by insect. These
scenarios are the same as your computer if you do the port forwarding. Why?
Because you give exception for anything to go through without was thoroughly
check by your system. They just let them through. It does not matter if you have
the powerful Anti-Virus or Spyware because once you give the exception, damage
has been done!! People easily can plan something inside your computer and more
worst they know you IP. And using right tools they can scan your computer for
any loop holes due to port forwarding. In the end, if you use your internet for
online banking, people can know all your personal stuff. Amazing huh?

So please think first before allowing your PC for port forwarding. It give more
harm than good.

Source: http://koneksen.com/port-forwarding/