1. this is not BO server ports.
2. Port 8080 in the BO Web applications is the default port used by the tomcat.
3. To change it, you need to edit server.xml , make change to the connector and restart tomcat.
4. You need to select port not used by anything else on the same network or it'll won't work.
for more details please use http://wiki.apache.org/tomcat/HowTo