Filemaker Pro 11 instant web publishing access problem from web
I have exhausted the Filemaker forum and my issue needs airport dual-n extreme base station expertise - so I'm posting this problem. I've added a link to Filemaker's instant web publishing to my web site so that visitors can access my studio database for additional information about my art work. The problem is that no one can access this database from outside my local network. Within my wireless and wired networks I can reach the database typing in this address http://10.0.1.**:591/fmi/iwp/res/iwp_home.html. I recognize that this is a port mapping problem but I am not sure of the settings. This is what I have set up so far - which hasn't worked: through my network preference panel, I have allocated a static ip address to my iMac (10.0.1.**), I've assigned the Filemaker IWP to use port 591 (the official port for IWP) and am using DynDNS.org for web based IP detection to my host (99.25.***.***). I have checked off Enable NAT port mapping protocol in the airport utility network panel. What's frustrating is that other web services work well (i.e., logmein, servetome, dropbox and back to my mac) and don't appear to have any special port mapping indicated within the airport utility network settings, so within the Airport network settings I manually assigned the TCP/UDP to 591 and tried to match descriptions of services to what service I think IWP. I did notice that while Filemaker Pro uses the 10.0.1.**:591 address, Airport Utility network assigns a private IP address which is different (10.0.1.***). I don't know if that private IP address is important and I am also not sure if I have the address syntax correct [99.25.***.***:591 OR 99.25.***.***/10.0.1.**:591 OR [my host name].dyndns.org:591 OR some variation]. But nothing works. Any suggestions for solving this frustrating problem would be greatly appreciated.
iMac, Mac OS X (10.7.3), 2.93GHz Intel Core i7, 16GB ram