Multiple RAC databases in Enterprise Manager

Hey, I installed 3 databases on a 2-node rac.
srvctl show database -d <dbname>
shows all 3 database are up and running. Everything is working fine.
Just the Enterprise Manager is working on the first database (port 1158)
For all other databases (port 5500 and 5501) the EM comes up with: Cluster status not available
Is there anything I need to do, so that I can see all 3 database within the EM ?
I know, Grid Control is the tool to choose, but anyway, I should see the status of the cluster for all 3 databases, correct ?
Chris

I configured my 3 databases.
db1 and db2 have as remote_listener parameter the scan listener:1521 configured
db3 has another value for the remote_listener, because I need this remote listener, so that my db3 is registering on my connection manager servers
In this scenario db1 and db2 are working with the EM - db3 is not - but db3 is registering its services on my connection managers
When changing the remote_listener entry for db3 the Enterprise Manager is running here as well - but no more registering of services at cman servers :-(
So thats the questions:
How to register all databases with the listener, so that EM is running for all databases, and also how to configure db3 so that its registers its services at cman servers ???
Thx for your help in advance
Chris
Thats my listener configuration in the Grid Home
LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))) # line added by Agent
LISTENER_SCAN1=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1)))) # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON # line added by Agent
the part for the scan listener (which is configured in the database as the remote_listener parameter) looks like:
remote_listener=listener_cluster:1521
listener-cluster=
(address_list=
(address=(protocol=tcp)(host=dbsrv01)(port=1521))
(address=(protocol=tcp)(host=dbsrv02)(port=1521))
#Remote Listener fuer Connection Manager
cman_listener =
(address_list=
(address=(protocol=tcp)(host=cmansrv01)(port=1610))
(address=(protocol=tcp)(host=cmansrv02)(port=1610))
)

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Resolving localhost.localdomain... 127.0.0.1
Connecting to localhost.localdomain|127.0.0.1|:1158... connected.
HTTP request sent, awaiting response... 200 No headers, assuming HTTP/0.9
Length: unspecified
Saving to: `em'
[ <=> ] 7 --.-K/s in 0.002s
11:36:33 (4.15 KB/s) - Read error at byte 7 (Connection reset by peer).Retrying.
--11:36:34-- (try: 2) http://localhost.localdomain:1158/em
Connecting to localhost.localdomain|127.0.0.1|:1158... connected.
HTTP request sent, awaiting response... 200 No headers, assuming HTTP/0.9
Length: unspecified
Saving to: `em.1'
100%[=================================================================================================================>] 7 --.-K/s in 0s
11:36:34 (16.8 KB/s) - Read error at byte 7 (Connection reset by peer).Retrying.
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