How to fix the Oracle error NNC-00427: server does not support this version of the protocol?

In this post, you’ll learn more about the Oracle ErrorNNC-00427: server does not support this version of the protocol with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

NNC-00427: server does not support this version of the protocol

Reason for the Error NNC-00427: server does not support this version of the protocol

Cause: A name server message with an incompatible protocol version was received by a name server or the name server program interface. This problem will occur when there are clients and servers with widely varying protocol versions that are trying to communicate.

How to fix the Error NNC-00427: server does not support this version of the protocol ?

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

Action: upgrade older client and server software so it is compatible with newer software.