Cause: The listener received a request to establish a

connection to a database or other service. The connect

descriptor received by the listener specified in addition to

the service name an instance name for an instance (usually a

database instance) 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.