plsql developer连接oracle 12.2报错 ora-28040 No matching authentication protocol

plsql developer连接oracle 12.2报错 ora-28040 No matching authentication protocol

使用plsql连接时,发现报ora-28040 No matching authentication protocol

赶紧查了查MOS,原来在默认情况下Oracle12.2对客户端版本有限制,

解决方法:升级Oracle客户端或者修改sqlnet.ora中的以下两个参数控制:

SQLNET.ALLOWED_LOGON_VERSION_SERVER=10

SQLNET.ALLOWED_LOGON_VERSION_CLIENT=10

select username, account_status, default_tablespace, created, password_versions from dba_users;

USERNAME ACCOUNT_STATUS DEFAULT_TABLESPACE CREATED PASSWORD_VERSIONS
--------------- ---------------------------------------------------------------- ------------------------------------------------------------ ------------ ----------------------------------
SYS OPEN SYSTEM 26-JAN-17 10G 11G 12C
SYSTEM OPEN SYSTEM 26-JAN-17 10G 11G 12C

password_versions表明当前用户口令的认证方式.

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