OEM: No database discovered

i've installed Oracle Enterprise Manager v2.2 server and console
on a Windows 2000 machine. i'm trying to get it to manage a
Linux based Oracle 8.1.7 database server. the database node
seems to be correctly configured in the OEM console but when
i try to start the DBA studio from the OEM console i get the
following error message:
VTO-4400: No database has been discovered. Please use the
Enterprise Manager console to discover at least one database
before starting the application.
should the databases on a database server node be discovered in
some way in addition to the node itself? should this be done
automatically? any ideas on why it isn't working in my case
though the node discovery still works?

I also have the same problem.
Check if your OracleOraHome81Agent is running. This is
installed on each node and runs jobs, collects data on remote
sites and monitors events sent by the OMS. OEM uses this agent
to discover services on the node where it resides.
On command prompt do lsnrctl dbsnmp_status to check. Or control
panel --> double-click services icon. Select
OracleOraHome81Agent and click start push button.

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