How to fix the Oracle error TNS-12647: Authentication required?

In this post, you’ll learn more about the Oracle ErrorTNS-12647: Authentication required with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12647: Authentication required

Reason for the Error TNS-12647: Authentication required

Cause: The parameter that controls whether authentication is required was set to true, but the executable does not have an authentication service linked in.

How to fix the Error TNS-12647: Authentication required ?

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

Action: Either re-link the executable with an authentication service adapter or disable the parameter.