Thank you for your post.
In order for Instant Web Publishing to work, you need an IP Address. Pull down the File menu and select "Sharing -> Instant Web Publishing...". When you turn on Instant Web Publishing, the IP address will display. Other users can then launch a browser and enter this IP address to access your database files via Instant Web Publishing. If this IP address is going to frequently change, then it may not be possible.
Thanks TSGal. The setup was actually Ok, I did have the ip address from the sharing screen.
I found out that this has something to do with our company's proxy server, and I was told it might need to use SSL, so I'm going to try Filemaker Server to see if that helps. I'll post my experience,