Cause: The listener received a request to establish a connection to a database or other service. The connect descriptor received by the listener specified a service name for a service (usually a database service) that either has not yet dynamically registered with the listener or has not been statically configured for the listener. This may be a temporary condition such as after the listener has started, but before the database instance has registered with the listener.
Action:
- Check your database service are started.
- Wait a moment and try to connect a second time.
- Check which services are currently known by the listener.
- Check that the SERVICE_NAME parameter in the connect descriptor of the net service name.
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