In this post, you’ll learn more about the Oracle ErrorORA-12564: TNS:connection refused with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-12564: TNS:connection refused
Reason for the Error ORA-12564: TNS:connection refused
The connect request was denied by the remote user (or TNS software).
How to fix the Error ORA-12564: TNS:connection refused ?
You can fix this error in Oracle by following the below steps
Not normally visible to the user. For further details, turn on tracing and reexecute the operation.