Unable to connect to natted public IP on same network behind pix

I have a situation that I would normally resolve by setting up fake internal DNS zones that resolve to the private IP, but in this case it isn’t an option. So I need to know if it is possible (feaseable or a bad idea) to connect to the natted public IP of a server from another system on its same network.

Here is a brief example:

Server
10.5.10.100 nat to 66.xx.xx.70
port 80,443 exposed on fw

Admin workstation on same subnet
10.5.10.150

Cannot hit 66.xx.xx.70 from 10.5.10.150

Firewall logs show a built connection, but no traffic ever flows.

Any suggestions would be appreciated.