问mariadb 低版本 能登录高版本吗？

高版本登录低版本可以

[root@gaolinux81-1 ~]# mysql -uuser1 -p123456 -h192.168.158.182 -P3306

Welcome to the MariaDB monitor. Commands end with ; or \g.

Your MariaDB connection id is 13

Server version: 10.3.10-MariaDB MariaDB Serve

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> exit

登录本机可以

[root@gaolinux81-1 ~]# mysql -uuser1 -p123456 -h192.168.158.181 -P3306

Welcome to the MariaDB monitor. Commands end with ; or \g.

Your MariaDB connection id is 9

Server version: 10.4.12-MariaDB MariaDB Serve

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

低版本登录高版本 不可以 防火墙关闭

[root@gaolinux81-2 mariadb]# mysql -uuser1 -p123456 -h192.168.158.181 -P3306

ERROR 2002 (HY000): Can't connect to MySQL server on '192.168.158.181' (115)

登录本机可以

[root@gaolinux81-2 mariadb]# mysql -uuser1 -p123456 -h192.168.158.182 -P3306

Welcome to the MariaDB monitor. Commands end with ; or \g.

Your MariaDB connection id is 15

Server version: 10.3.10-MariaDB MariaDB Serve

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

有大神知道原因吗？