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SA520 NAT Problem

I have a newly purchased SA520 (Firmware 2.1.71) that I am trying to get setup to work with an RDS server (and eventually to work with a Windows VPN server) but I don't seem to able to get NAT working correctly.

I have added the public IP address as an IP Alias in the WAN settings, added 3389 as a service, setup a WAN to LAN rule to allow 3389 traffic from the IP alias to the internal IP but simply can't make a connection. I believe, according to other posts and the user manual, that this is what I need to do but is there something I'm missing?

I have also tried downgrading the firmware, adding a static route and creating an outgoing rule from the internal IP to the IP alias for 3389 traffic but all of this has not worked; there doesn't appear to be anything in the logs either. I know the server and router are working correctly as I can connect to the server using 1:1 NAT through our old Sonicwall no problem at all.

Hopefully I'm missing something obvious but as our current firewall is on it's last legs I need to get this sorted ASAP. Thanks for any help.

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