无法从远程服务器连接到MySQL

我无法从Azure访问我的Ubuntu 16.04.02 VPS上的MySQL服务器。我试着编辑/etc/mysql/my.cnf，但是什么也没做-没有像bind 127.0.0.1这样的东西。我使用通配符创建了用户，但仍然无法连接。我能做什么？

my.cnf

#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#

!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/

终端输出：

azure@pinf-vps:~$ sudo lsof -Pni :3306
COMMAND   PID  USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
mysqld  29117 mysql   15u  IPv4 2516519      0t0  TCP 127.0.0.1:3306 (LISTEN)

我还仔细检查了端口是否在VPS和防火墙中打开。

谢谢你的帮助。