Bad construction of widgets' URL in Rave Portal

I deployed Rave in an Apache Tomcat 6.x which uses the port 5580. I have an Apache server in another machine which redirects the request from Internet to the server in which is installed Rave (example from miserver.com to 192.168.1.32:5580).

So I configured the portal.properties like this:

portal.opensocial_engine.protocol=http
portal.opensocial_engine.root=miserver.com:80
portal.opensocial_engine.gadget_path=/gadgets

But when I login, the widgets are not found (404) because Rave searches in the URL http://miserver.com:5580/gadgets..... instead of http://miserver.com/gadgets..... despite I specified the port 80. Without specifying the port (portal.opensocial_engine.root=miserver.com) I have the same problem.