Do you have FileMaker Network sharing turned on ?
What is the ip address when you turn on FileMaker Network sharing ?
What ip address is port 5003 forwarding to on your router ?
www.ipchicken.com will display your public ip address.
Yes its turned on.
> 18.104.22.168 public ip
Here is information on your router how to port forward.
The database you are hosting must be running on the host computer, before you can connect from remote device.
This is a website to test if port 5003 is open on your network. Just enter your ip address, which should be automatically entered and then enter port 5003
If you have any firewalls installed on your computer, you will have to open port 5003 in the firewall.