PLSQL连接Oracle 19c报错ORA-28040

原因解析

使用PLSQL Developer连接19c数据库报错：

ORA-28040: No matching authentication protocol

报错信息解析：

[oracle@ora19c ~]$ oerr ora 28040

28040, 0000, "No matching authentication protocol"
// *Cause:  There was no acceptable authentication protocol for 
//          either client or server.
// *Action: The administrator should set the values of the
//          SQLNET.ALLOWED_LOGON_VERSION_SERVER and 
//          SQLNET.ALLOW