Conheço duas formas de resolver:
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Emmysql.conf, comenteskip-networking.
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Tente configurar o socket assim:
var client = mysql.createClient({ user: uuuu, password: pppp, host: '127.0.0.1', port: '3306', _socket: '/var/run/mysqld/mysqld.sock',});
mysql.conf , comente skip-networking . var client = mysql.createClient({
user: uuuu,
password: pppp,
host: '127.0.0.1',
port: '3306',
_socket: '/var/run/mysqld/mysqld.sock',});