How to fix the Oracle error TNS-12658: ANO service required but TNS version is incompatible?

In this post, you’ll learn more about the Oracle ErrorTNS-12658: ANO service required but TNS version is incompatible with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12658: ANO service required but TNS version is incompatible

Reason for the Error TNS-12658: ANO service required but TNS version is incompatible

Cause: A client process that is running an earlier version of TNS attempted to connect but the connection failed because the server process required that an ANO service (authentication, encryption, etc.) be used.

How to fix the Error TNS-12658: ANO service required but TNS version is incompatible ?

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

Action: Relink the calling executable and retry the connection or eliminate the requirement that the service be used on the server side.