So you do NOT have a static IP address from your provider, correct? It might be wise to get a dynamic DNS (IE dyn.com) address now so you can avoid the headaches later of changing all of your references once your ISP decides to cycle your IP Address.
You said you have port forwarding enabled, but do not mention if you are allowing port 5003 through your router's firewall. Is that firewall enabled, and do you have the proper exceptions? Make sure to read up on all the ports here:
A lot of routers block ping requests, so it's not always a telltale sign. Your host firewall is already configured correctly if you can access things on your LAN.
Also, is you macbook on a different network when trying to access your WAN address? If you're still on the LAN when testing it might cause issues.
Thanks for taking the time to respond. Here are some answers to your questions …
1. You’re right, I don’t have a static IP address. I’ve already signed up to noip but was testing on the raw IP address to cut out a possible point of failure. The IP address noip have for me is the same as returned by whatismyipaddress.com so I think that’s all working fine anyway ..
2. Port forwarding; yes port 5003 is enabled
The way this router seems to work is 2 step
a. ‘Game of Application Ports’
Game / Application name: FileMaker 13
Port Range: 5003-5003
Translate to: 5003-5003
b. Assign Application ‘FileMaker 13’ to device ‘Mac mini name’
On the router uPnP is off, as is DMZ, IPv6 Pinholes (that’s a new one to me)
The firewall is set to default (‘Allow all outgoing connections and block all unsolicited incoming traffic. Games and application sharing is allowed’) which sounds about right to me
It’s *only* port 5003 that I have enabled in port forwarding; my understanding being that this is all that’s required to access a remote FMS app ..
3. Routers blocking ping requests. Yes that’s a fair point; I can’t see a setting on the server to block / allow pings, but it makes sense to not respond by default rather than vice versa.
Which is frustrating in this case as it would be useful to be able to see if I’m actually getting to my machine at all…
4. The MacBook is on the same WAN, but if I use FileMaker GO from my iPhone & turn WiFi off (so I’m definitely connecting over cellular), I get the same behaviour:
a. WiFi on & accessing ‘server.local’ - all is fine
b. WiFi off & accessing a remote server by entering the IP address - no joy (‘no files available’)
So still no answers I'm afraid
While poking around the router settings I found a screen that shows the target IP address, rather than just the machine name. The target IP address was not the same as the Mac mini’s IP address from About this Mac > More > System Report > Network.
The router had a device named ‘server,’ so I tried that - it came up with the mini’s IP address & now FileMaker Go on the iPhone can access the FMS apps over cellular.
So I’m going to set the mini up with a status IP address to make sure this doesn’t happen again.
But that’s good news
Good news indeed!