About blocked ports
By default, the Personal Firewall blocks a list of ports used by Trojan attacks when malicious individuals try to gain access to your computer. Many network attacks can be avoided by preventing access to these ports.
A port is an entry point computers use to connect to networks or to other computers to exchange information. Every port has a unique number and based on this number, the receiving computer determines which application to send received data.
To view the list of blocked ports:
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On the PC-cillin window, click Settings. The Settings window appears.
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On the Settings menu, click the Personal Firewall link. The menu expands.
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Click the Blocked Ports link. The Blocked Ports screen appears.
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Under the Port list, you can view the Trojan name, protocol, and the number of the port the Trojan tries to access when attacking.
See also:
Enabling your Personal Firewall