How to fix the error ORA-00126: connection refused; invalid duplicity?

In this post, you’ll learn more about the Oracle ErrorORA-00126: connection refused; invalid duplicity with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-00126: connection refused; invalid duplicity

Reason for the Error ORA-00126: connection refused; invalid duplicity

The DUPLICITY in the CONNECT_DATA of the TNS address DESCRIPTION is not correct or is not supported.

How to fix the Error ORA-00126: connection refused; invalid duplicity ?

You can fix this error in Oracle by following the below steps

Correct the DUPLICITY specified in the TNS address.