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8. Security > 81. Close Down Open Ports and Block Protocols

Close Down Open Ports and Block Protocols

You don’t need a firewall to protect your PC; you can manually close down ports and block certain protocols.

As noted in [Hack 77] and [Hack #78] , firewalls can protect your PC and your network from intruders. But if you don’t want to use a firewall and you still want protection, you can manually close down ports and block protocols.

Some of these ports and protocols are more dangerous than others. For example, leaving open the port commonly used by Telnet (port 23) means someone could use that service to take control of your PC. And the infamous Back Orifice Trojan, which also can give malicious users complete control of your PC, uses a variety of ports, including 31337 and 31338, among others. For a list of which ports are used by Trojans, go to http://www.sans.org/resources/idfaq/oddports.php.


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