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To be fair to Cisco, this is the principle used by enterprise firewalls. It's pretty much global and hence the knowledge is very transferable. To be fair to you, this isn't an enterprise firewall so Cisco could document it better without assuming end...
I just had this problem and a search revealed this thread. It's not immediately obvious, I had to guess and experiment.In short, you leave the auto-rule in place. You then create two more rules:Rule 1: ALLOW / RDP / Source Interface = WAN1 / Source =...