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Port Triggering on ISA500 Series Integrated Security Appliances

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When a specific type of traffic is sent through a specific outbound  port, Port Triggering opens a specific inbound port for responses from  the destination of the outbound traffic.  Port Triggering opens ports  when a network device connects to an  outbound port, but only opens the  inbound port to one device at a time. 600 seconds after the data  exchange is complete, the open ports are closed for security and to make  the ports available for other uses. For this reason, Port Triggering is  more secure and flexible than Port Forwarding. Port Triggering is  useful when a remote server requires that data to be sent from one port but  then the remote server sends responses to another port.

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