As far as I know, the SA doesnot make any connections from the External interface. The External Interface only receives user connections and all connections made from the SA (to Auth servers, Web/Terminal Service resources etc) are initiated from the Internal interface of the SA. Below is an extract from the 7.1 Admin Guide explaining this. QUOTE The internal port, also known as the internal interface, handles all LAN requests to resources, listening for Web browsing, file browsing, authentication, and outbound mail requests The external port, also known as the external interface, handles all requests from users signed into the SA Series Appliance from outside the customer LAN, for example, from the Internet. Before sending a packet, the SA Series Appliance determines if the packet is associated with a TCP connection that was initiated by a user through the external interface. If that is the case, the SA Series Appliance sends the packet to the external interface. All other packets go to the internal interface. UNQUOTE Hope this helps :-)
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