Port listening on localhost:8000 but not on ip:8000

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http://askubuntu.com – Hello I'm running a web application on port 8000. When I access it from the host server localhost:8000 it responds ok, also works, but does not work. is the ip of my server. Also if i try to go to another web application running on port 80 it works I enabled ufw firewall and set ufw default allow. I am using ubuntu server 12.04 Any suggestions on why I can't get to my app on port 8000 using the ip-address:8000? Thanks in advance! (HowTos)