To start the Oracle Enterprise Manager do:
1. Log in
<oracle_user>/<password>
2. Start-up the instance
[bash]cd $ORACLE_HOME/opmn/bin
opmnctl startall #start all services
opmnctl status #view the services active/down
opmnctl status -l #view statuses and ports used[/bash]
3. Start em console
[bash]./emctl start dbconsole #start the em console[/bash]
4. Log on to em console (web interface)
[text]http://<domain_name>:7777/em/console
oc4jadmin/<password>[/text]