How to fix the Oracle error NNC-00003: error opening stream string?

In this post, you’ll learn more about the Oracle ErrorNNC-00003: error opening stream string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

NNC-00003: error opening stream string

Reason for the Error NNC-00003: error opening stream string

Cause: A name server or client program attempted to open a connection to another server and failed, either because the server is down, or because the network path to that server is not working. This error is usually displayed underneath an error which describes the problem in more detail.

How to fix the Error NNC-00003: error opening stream string ?

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

Action: Make sure that the server being connected to is listening on the address used, and that there is network connectivity between the two end-points.