Oracle12c连接问题[ORA-28040]

问题重现：

在虚拟机环境上安装Oracle 12c数据库后，配置好监听，启动好数据库，在Windows上远程连接数据库报错：ORA-28040

解决方法：

在$ORACLE_HOME/dbs/network/admin/下修改sqlnet.ora文件，在最后面新增如下内容：

SQLNET.ALLOWED_LOGON_VERSION=8

如图：



解决思路：

[oracle@localhost dbs]$ 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.ALLOWED_LOGON_VERSION_CLIENT parameters, on both the

// client and on the server, to values that match the minimum

// version software 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, that account’s

// password must be reset, in order for the required verifier to

// be generated and allow authentication to proceed successfully.