ORA-12516: TNS:listener could not find available

admin

ORA-12516:TNS:listener could not find available handler with matching protocol
stack
Cause: None of the known and available service handlers forthe given SERVICE_
NAME support the client's protocol stack: transport, session, and presentation
protocols.
Action: Checkto make sure that the service handlers (e.g. dispatchers) for the
given SERVICE_NAME are registered with the listener, are accepting connections,
and that they are properly configured to support the desired protocols.