After upgraded an Oracle database from 11.2.0.4 to 12.2.0.1 I receive the error “ORA-28040: No matching authentication protocol exception” during one of our applications tried to connect to this database. This is due to the fact that in version 11G the parameter SQLNET.ALLOWED_LOGON_VERSION_SERVER had the default value 8 while in version 12c it is 11. Knowing this, after changing the value of the parameter in the sqlnet.ora file the problem has been solved. Portuguse / Português Depois de atualizar um banco de dados Oracle 11.2.0.4 para 12.2.0.1 eu recebir o…