For the oracle database Enterprise Manager (EM) runs on port 1158. But it needs to be started by itself.
Linux
Login as oracle and run:
$ORACLE_HOME/bin/emctl start dbconsole
On some systems a xserver session needs to be running for the graphs to be created correctly. The best solution for this is to run vncserver on port 5910 and set the display to use :10.
Run:
vncserver :10
set DISPLAY=localhost:10
Then start EM.