From the main console page, click on “Personal Firewall Controls”.
Click on “Personal Firewall” and then click the “Settings” link.
Be sure the box next to “Activate the Personal Firewall” is checked.
Choose the Security Level of Firewall Profile that best suits your personal needs. You can choose between Maximum, Medium, Low and Minimum. TrendMicro defaults to Medium. This security level allows other computers to communicate with yours freely, but dangerous or unrecognized incoming or outgoing connections trigger warnings.
When done, click OK.