ORA-12217: TNS:could not contact PREFERRED_CMANAGERS

admin

ORA-12217: TNS:couldnot contact PREFERRED_CMANAGERS in TNSNAV.ORA
Cause: There is a syntax error in the PREFERRED_CMANAGERSentry, or
addresses specified are wrong, or the intended Connection Managers are
unavailable.
Action: Checkthe PREFERRED_CMANAGERS entries in the client's
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.