Oracle® Database 11g / 12c / 18c error codes ORA-12216: TNS:poorly formed PREFERRED_CMANAGERS addresses in TNSNAV.ORA

ORA-12216: TNS:poorly formed PREFERRED_CMANAGERS addresses in TNSNAV.ORA

Oracle Error Code: ORA-12216

Cause: Address binding for the PREFERRED_CMANAGERS entry in the client''s TNSNAV.ORA file is improperly entered.

Action: Define the ADDRESS as part of the PREFERRED_CMANAGERS binding.