MySql.Data.MySqlClient.MySqlException (0x80004005): Host Desktop is not allowed to connect to this mariabd server error code example
Example: host is not allowed to connect to this mysql server
CREATE USER 'username'@'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost' WITH GRANT OPTION;
CREATE USER 'username'@'%' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' WITH GRANT OPTION;
FLUSH PRIVILEGES;