Fire doors and walls are there to protect you – make sure you keep them closed.
What sort of door do I mean? A physical door as in for example a fire door? Or do I mean a virtual door like your Internet connection?
Doors exist to block a hole. They block the hole for a number of reasons, but probably the biggest reason is to improve security.
How often do you visit an office and find that something is propping open a fire door to improve air circulation? What happens in the event of a fire? Will somebody remember to remove the prop so that the door can close and shut off the fire’s progress?
The same applies to Internet security and firewalls: the virtual doors that shut off access to your internal systems from unwanted visitors.
If you have a laptop with Wi-Fi, try this next time you are in an area with a public access Wi-Fi hotspot. Open up your network neighbourhood and see who else’s laptop or mobile phone you can see. I don’t advocate that you try and access one of these devices as this could be construed as criminal activity, but the likelihood is that if the laptop is advertising its presence, it has one or more services open.
If you do use your laptop in a public place, make sure you have enabled the local firewall. Windows and Mac laptops have these: use them.
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