I have a problem while starting Oracle Enterprise Manager. I have install on Oracle Virtual Box the 'Oracle Technology Network Developer Day - Hands-on Database Application Development'. During first time loaded it worked fine. After I shut down the environment and start it later, while executing the 'emctl start dbconsole' from terminal I get the following error: 'OC4J Configuration issue. /home/oracle/app/oracle/product/11.2.0/dbhome_2/oc4j/j2ee/OC4J_DBConsole_Unknown-08-00-27-cd-0e-05.lan_orcl not found. '. Is these problem related with the MAC address. What can I do to fix it?
During the first time it worked, you must have had "Host only" network adapter.
Next time you might have changed to NAT or something else.(DHCP assigned hostname)... or the other way around.
Try changing your network adaptor settings between these two options and see whether your DB Control comes up.