Oracle - Error al conectar Oracle Enterprise

Espero que me ayuden con un problema. Al intentar conectar con Oracle Enterprise Database me aparecel el siguiente error en el navegador: 503 Service Unavailable
Servlet error: An exception occurred. The current application deployment descriptors do not allow for including it in this response. Please consult the application log for details.

Como puedo solucionarlo? Corre en una máquina virtual de VMware y en un Win xp. Versión 11g.

Tomado de otro foro:

"Hi.
I suggest you reconfigure OEM using the emca utility. This will make sure all your repository information is correct.

Code: Select all
emca -config dbcontrol db -repos recreate"

"This error can be seen for many reasons.
One of them is that the database or listener aren't up and runing. Thus, the sysman repository isn't available. You can search the Enterprise Manager Grid Control forum."

Eso era lo mismito que yo iba a decir... posiblemente el Listener no esta bien levantado o bien no tienes corriendo el EMCA.