How to fix the Oracle error TNS-02503: Parameter retrieval failed?

In this post, you’ll learn more about the Oracle ErrorTNS-02503: Parameter retrieval failed with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-02503: Parameter retrieval failed

Reason for the Error TNS-02503: Parameter retrieval failed

Cause: The native service layer was unable to retrieve a parameter from a configuration file.

How to fix the Error TNS-02503: Parameter retrieval failed ?

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

Action: If it is possible, enable tracing and attempt to reproduce the problem. In any event, contact Oracle Customer Support.