open a port

[#1]

I am trying to open up the firewall to pass through port 20 to any machine. I' ve added a policy to wan1->internal source and destination are set to all i' ve created a custom service and put in the following settings TCP source port: 1-65535 destination: 20 for high and low i apply and run a port scan on the unit but it is not seeing port 20 as open. i can see where smtp, http, etc are open so i' m not sure if i have the settings wrong. thanks.

[rwpatterson]

You cannot do that, only because the firewall needs to know exactly which unit on the inside will be responding on that port. You need to create a virtual IP mapping. If it' s multicast traffic you' re talking about, that' s a whole different can of worms.