How to fix the Oracle error TNS-12686: Invalid command specified for a service?

In this post, you’ll learn more about the Oracle ErrorTNS-12686: Invalid command specified for a service with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12686: Invalid command specified for a service

Reason for the Error TNS-12686: Invalid command specified for a service

Cause: An operation which does not exist was specified for a native service.

How to fix the Error TNS-12686: Invalid command specified for a service ?

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

Action: This is a programming error and should not normally be visible to the user. If the error does appear, contact Oracle Customer Support.