ORA-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.
Action
Possible solutions:
- Change the entry in sqlnet.ora that determines which services are to be used.
- Relink the client with at least one of the authentication service adapters that the server supports.
- Relink the server with at least one of the authentication service adapters that the client supports.
- Disable authentication on both the client and server.