Security / Firewalls :: Access Via Localhost Works But Through External IP Doesn't

I need remote access to certain programs on my home PC but I just cannot get it to work.

Program:- webcamXP

When I set the programs port preferences (i.e. port 8087), I can connect with"127.0.0.1:8087" and webcamXP work fine. But when I replace the localhost with my external IP (lets say 79.149.114.227, so that would be "http://79.149.114.227:8087".I tried port forwarding: I have added the port to my NAT in the router's setting so it should be fine, but it is not (numbers are fictual of course):

external port start 8085,
external port end 8089,
protocol TCP/UDP,
internal port start 8085,
internal port end 8089,
server IP address 192.168.1.215)

I also tried disabling AVG Internet Security 2011's firewall temporarily just to check it it was blocking it, but got the same result.I checked if Windows own firewall was on, but it is off.I cannot find any setting in the router's own configuration screen to disable any build in (router's) firewall (if it has any).