oracle problem: ORA-28040: no matching authentication protocol

Oracle11g client connection Oracle12C server, configure items

Preconditions: Oracle11g client is installed, configured environment variables, log database with PL / SQL Developer

There is a problem: when logging database, suggesting that "ORA-28040: no matching verification protocol"

Solution:

① / admin directory in oracle 12C sqlnet.ora new file server $ oracle_home / network

SQLNET.ALLOWED_LOGON_VERSION_SERVER=11;
SQLNET.ALLOWED_LOGON_VERSION_CLIENT=11;

② On the server side, the administrator login, change password

sqlplus /  AS sysdba
 the ALTER the session the SET Container = service name;
 the ALTER  the User service name IDENTIFIED by password;

Note: After configuring the server sqlnet.ora file, be sure to re-modify the password, or throw login fails