User`s manual

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5.3.2 Port Triggering
Some applications require that specific ports in the device's firewall be opened for
access by the remote parties. Port Trigger dynamically opens up the 'Open Ports'
in the firewall when an application on the LAN initiates a TCP/UDP connection to a
remote party using the 'Triggering Ports'. The device allows the remote party from
the WAN side to establish new connections back to the application on the LAN
side using the 'Open Ports'. A maximum of 32 entries can be configured.
To add a Trigger Port, click the Add button. The following screen will display.