The Firewall exception list contains entries you can configure to allow or block different kinds of network traffic based on client port numbers and IP addresses. During an outbreak, the Security Server applies the exceptions to the Trend Micro policies that are automatically deployed to protect your network.
For example, during an outbreak, you may choose to block all client traffic, including the HTTP port (port 80). However, if you still want to grant the blocked clients access to the Internet, you can add the web proxy server to the exception list.