How to fix the Oracle error TNS-12639: Authentication service negotiation failed?

In this post, you’ll learn more about the Oracle ErrorTNS-12639: Authentication service negotiation failed with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12639: Authentication service negotiation failed

Reason for the Error TNS-12639: Authentication service negotiation failed

Cause: No match was found between the types of authentication services that the client supports and those that the server is using.

How to fix the Error TNS-12639: Authentication service negotiation failed ?

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

Action: Possible solutions:

1. Change the entry in sqlnet.ora that determines which services are to be used.

2. Relink the client with at least one of the authentication service adapters that the server supports.

3. Relink the server with at least one of the authentication service adapters that the client supports.

4. Disable authentication on both the client and server.