Oracle Message TNS-12217 - TNS: could not contact PREFERRED_CMANAGERS in TNSNAV.ORA

ERRORTNS: could not contact PREFERRED_CMANAGERS in TNSNAV.ORA
CAUSEThere is a syntax error in the PREFERRED_CMANAGERS entry, or addresses specified are wrong, or the intended Connection Managers are unavailable.
ACTIONCheck the PREFERRED_CMANAGERS entries in the clients TNSNAV.ORA file and correct them or talk with your network administrator to determine if the specified Connection Managers are available. Verify that the Interchanges are active by using the INTCTL STATUS command.