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The FTP service running on that port might have a vulnerability that was just discovered.If a hacker can see that you have the port open and have the vulnerable service running, then they could exploit the vulnerability and gain access to your computer.If implemented correctly, a network firewall can essentially make your PC invisible to bad guys.If they can't see your computer, then they can't target you for network-based attacks.Many home network router products include built-in firewall support.The administrative interface of these routers includes configuration options for the firewall.Assumption: My internet connection at my dormitory is being blocked by Mc Afee's firewall.How I know: The internet connection works perfectly as long as Mc Afee's firewall is turned off.

These network firewalls also provide an extra measure of safety by hiding internal LAN addresses from the outside Internet.No Inbound Access needed The Monitoring Client accepts no incoming network traffic.No port forwarding or additional configuration is required.You may have turned your PC's or Wireless Router's firewall feature on at some point, but how do you know if it's really doing its job?The main purpose of a personal network firewall is to keep whatever is behind it safe from harm (and by harm I'm talking about hackers and malware).

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