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 Show all A firewall is software or hardware that checks information coming from the Internet or a network, and then either blocks it or allows it to pass through to your computer, depending on your firewall settings. Even if you think there's nothing on your computer that would interest anyone, a worm could completely disable your computer, or someone could use your computer to help spread worms or viruses to other computers without your knowledge. Here are answers to some common questions about firewalls.  What does "allowing a program to communicate through the firewall" mean? Allowing a program to communicate through the firewall, sometimes called unblocking , is when you allow a particular program to send information through the firewall. You can also allow a program to communicate through the firewall by opening one or more ports. For more information, see Allow a program to communicate through Windows Firewall.  How can I be ...

Is Your Network Equipment Running Too HOT? It’s hot outside!  Very hot!  At least people can grab a cold glass of lemonade or jump in a swimming pool to get some relief from the scorching summer temperatures.  Your poor servers, workstations and laptops are not so lucky.  They are stuck in their environmental conditions.  With that in mind, here are some tips to ensure your equipment does not fail due to extreme temperatures.  Computer processors can reach 150° F.  That’s hot!  Computer equipment needs the ambient room temperature cool so their fans can use it to cool their internal parts.  Below 75° F is preferable.  Try not to allow the room temperature to exceed 80° F.  Anything above that, and the air is too hot to provide adequate cooling. Computer rooms need separate A/C systems.  If you only have one main system, it might be 75° F where the thermometer is located, but 120° F in the closed server room or clos...