How to fix the Oracle error TNS-12665: NLS string open failed?

In this post, you’ll learn more about the Oracle ErrorTNS-12665: NLS string open failed with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12665: NLS string open failed

Reason for the Error TNS-12665: NLS string open failed

Cause: A native service was unable to make a string available for use by the National Language Support component.

How to fix the Error TNS-12665: NLS string open failed ?

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

Action: Make sure the National Language Support component has been properly. If it has, enable tracing and report the problem to Customer Support.