Thank you for your post.
Instant Web Publishing (IWP) allows a browser to interact with your data. With FileMaker Server, port 5003, 16016 and 16018 are needed. Please review Knowledge Base Article #6427 for the complete set of ports:
Please keep me updated with any progress.
i dont understand why ports 5003, 16016, 16018 make a difference.
iwp uses port 80. all other ports are used internally from filemaker and web server. on my own filmaker iwp server i only mapped port 80 (and 88, but that´s another story), all other ports are closed for external calls.
so when iwp works correctly from internal, it should work from external too.
@whit: try to map port 80, and make port 80 open to calls from external.
greetings from germany