How to fix the Oracle error NNL-00008: request not understood by server?

In this post, you’ll learn more about the Oracle ErrorNNL-00008: request not understood by server with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

NNL-00008: request not understood by server

Reason for the Error NNL-00008: request not understood by server

Cause: The control program issued a request to an Oracle Names server and the server did not understand the request.

How to fix the Error NNL-00008: request not understood by server ?

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

Action: If the server and the control program have different versions, they may be unable to communicate. Check your documentation for version compatibility constraints. If the server and control program are compatible, turn on tracing for further details, and re-execute the failing operation. If the error persists, contact Worldwide Customer Support.