ORA-28040: No matching authentication protocol

在服务端的sqlnet.ora文件中加入上如下信息，然后重启监听

[oracle@ora1221 admin]$ vi sqlnet.ora

  SQLNET.ALLOWED_LOGON_VERSION_CLIENT=8

  SQLNET.ALLOWED_LOGON_VERSION_SERVER=8

[oracle@ora1221 admin]$ lsnrctl stop

[oracle@ora1221 admin]$ lsnrctl start

参考网站：http://www.xifenfei.com/2016/07/ora-28040-no-matching-authentication-protocol.html