I can't reach WebDirect from 'outside' of my local network. My router is just fine configured with redirection of port 80, 443 and 5003. In fact, it was working well with FMS 15.
I found out that there is a curious IP address in FMS admin console (see below). My network is 192.168.1.x and server is .100, my outside static IP is xxx.161.165.226 (first number removed for security reason, but it's not 169)