Subsonic configure port 80 with Apache on Ubuntu

[punto03]

I have a small Ubuntu server 10.xx. I installed Apache as a web server on port 80. My company closed in 4040 and then exit the door I configure Subsonic on port 80. I can not do. When I enter http://localhost URL within the Apache server. I do not have any service on the proxy server. How can I do? Is there a way to run on port 80 and the web Subsonic? Ovviamente ho configurato in /etc/default/subsonic "--port=80" Thanks and sorry for my english "metallic"