User guide

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Port Filtering
Port Filtering allows you to enhance the security of your system by only allowing certain
applications to reach the Internet. The Port Filtering section displays the following:
• Port Filtering — restricts internet trac to specic applications. Select the check box next to
Port Filtering to turn Port Filtering on.
• Applications — select the check box next to one or more application (DNS, NNTP, SNMP, FPO,
POP3, Telnet, HTTP, SMTP) to turn the particular application on.
• Custom Applications — select Add Custom Application to add an application not included in
the applications section.
To enable Port Filtering and restrict Internet trac to specic applications:
➊ Click the Port Filtering check box.
➋ Click the application check box to enable/disable the selected application.
➌ Click Save Changes to apply any changes made to the Port Filtering application settings.