Computer Security 101
Source: About.com - Posted by Benjamin D. Thomas   
Security This sort of basic firewall has some issues that can be exploited by hackers and malicious programmers to sneak through which is why there are more advanced firewall systems. I mentioned that with this sort of port blocking, communications in response to connections initiated by your computer would be allowed through even on ports you were blocking. Using this knowledge, a hacker can forge the packet to make it look like it is a reply rather than an initiation of a connection and the firewall will allow it through.

Even on connections that ARE initiated by your computer, a malicious programmer can still exploit weaknesses in the system to sneak packets through. To guard against some of these weaknesses there are other types of firewalls- stateful inspection packet filters, circuit level gateway and application level gateways to name a few. For more details on firewalls see the article What Is A Firewall?.

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