Oracle Message TNS-12230 - TNS: Severe Network error occurred in making this connection

ERRORTNS: Severe Network error occurred in making this connection
CAUSEThis error is reported by an interchange which fails to make contact with the destination due to a physical network error while calling a destination.
ACTIONTry again later when the network service may have been fixed or report the problem to your Network Administrator so that he may fix the problem.