Can't connect to MySQL server error 111
It probably means that your MySQL server is only listening the localhost interface.
If you have lines like this :
bind-address = 127.0.0.1
In your my.cnf configuration file, you should comment them (add a # at the beginning of the lines), and restart MySQL.
sudo service mysql restart
Of course, to do this, you must be the administrator of the server.
ERROR 2003 (HY000): Can't connect to MySQL server on [IP] (111 Connection refused)
You can see your issue here
MariaDB [(none)]> SELECT User, Host FROM mysql.user WHERE Host <> 'localhost';
+--------+---------------+
| User | Host |
+--------+---------------+
| remote | [ Server A IP ] |
+--------+---------------+
You really need [Server B IP] here
GRANT ALL ON <DB>.* TO 'remote'@'server_B_IP';
This should do it.
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