My database says:
java.sql.SQLException: Listener refused the connection 
with the following error: 
ORA-12528, TNS:listener: all appropriate instances 
are blocking new connections 
The Connection descriptor used by the client was: 
I shut down and restarted the database.

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I addressed this issue in November 2004. You can see my answer here: ORA-12528 after shutting down and restarting instance. If that does not fix your problem, then on your database server, restart the Listener.
lsnrctl stop
lsrnctl start
Wait up to 10 minutes and then try to connect again.

This was first published in August 2006

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