Remote login to mysql with error 1045

I have set up mysql remote login through a tutorial here. It was working for a while. And it suddenly stops working.

bound to 0.0.0.0

root@ubuntu20:~# netstat -plant | grep 3306 tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 1026/mysqld tcp6 0 0 :::33060 :::* LISTEN 1026/mysqld

root@ubuntu20:~# ufw status To Action From

---

3306/tcp ALLOW Anywhere

I can log in locally with the remote user, dev.

mysql> SELECT User, Host FROM mysql.user; ±-----------------±----------+ | User | Host | ±-----------------±----------+ | dev | % |

When I try to remote login with the same user, I get error 1045.

What is the problem? I didn’t do anything to the server. It just stops working.