Oracle Solution for Error ora-12516

ORA-12516: TNS:listener could not find available handler with matching protocol stack

What triggered the Error:

None of the known and available service handlers for the given SERVICE_NAME support the client's protocol stack: transport, session, and presentation protocols.

What should we do to fix it:

Check to 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.