Configuring OEM 11g on Virtual Host

Hi,

We are facing some issue while configuring OEM 11g on Virtual host, we tried to drop, create / recreate the OEM but no luck, getting the below errors:

Database connection through listener failed. Fix the error and run EM Configuration Assistant again.

Some of the possible reasons may be:

1) Listener port 1521 provided is incorrect. Provide the correct port.

2) Listener is not up. Start the Listener.

3) Database service *service_name* is not registered with listener. Register the database service.

4) Listener is up on physical host and ORACLE_HOSTNAME environment variable is set to virtual host. Unset ORACLE_HOSTNAME environment variable.

5) Listener is up on virtual host. Set environment variable ORACLE_HOSTNAME=<virtual host>.