JBoss Portal can only run on the JBoss Application Server.
The latest releases will only run on JBoss AS4.
I saw this on the web:
JBoss Application Server (AS) 4.2.3, JBoss Enterprise Application Platform (EAP) 4.2, and JBoss EAP 4.3. In addition to the JBoss application server, the portal is designed to work on application servers such as Weblogic and Websphere. However, it is recommended that JBoss servers are used, for maximum value.
So was curious
That information is incorrect, but I guess you can't expect 100% accuracy on a thirdparty wiki :)