Advertisements No, he's talking about port triggering, like he said. You open port A for port triggering. If you access that port from outside the firewall, then it opens port B in the firewall and you can then use port B to get access to the TiVo. Port A gives no access to anything; it just provides the trigger point. The point being, as I understand it, that a port scanner won't find port B, as it's not open until you trigger it by hitting port A. Maybe you should learn to use Google.