Not sure how to fix your firewall issue. However, if your can't get it working, you may want to consider a Professional FileMaker Hosting Provider such as ourselves:
Feel free to let me know if you have any questions about our services either here or off-list to jmay(at)pointinspace.com. Thanks!
- John May
Nice place to advertise! Anyway fixed this - had link translation switched on on the web pulbishing rule should anyone else come across this problem.
Just trying to provide you with an alternative if you weren't able to get it working.