OCI-28040
The database does not accept your client's authentication protocol; login denied.
Cause
No common authentication protocol was found between the database client and server.
Action
Set the values of the SQLNET.ALLOWED_LOGON_VERSION_SERVER and SQLNET.ALLOWED_LOGON_VERSION_CLIENT parameters on both the client and on the server to values that match the minimum software version supported in the system. This error is also raised when the client is authenticating to a user account which was created without a verifier suitable for the client software version. In this situation, the password of the account must be reset to generate the required verifier and allow the authentication to proceed successfully.